Dell E520 User Manual

Dell Dimension E520 Service Manual

Dell™ Dimension™ E520 Service Manual

Before You Begin
About Your Computer
Technical Overview
Specifications
Advanced Troubleshooting
System Setup
Removing and Installing Parts

Notes, Notices, and Cautions

NOTE: A NOTE indicates important information that helps you make better use of your computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the

problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

If you purchased a Dell™ n Series computer, any references in this document to Microsoft® Windows® operating systems are
not applicable.

Information in this document is subject to change without notice.
© 2006 Dell Inc. All rights reserved.

Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and Dimension are trademarks of Dell Inc.; Intel, Pentium, and SpeedStep are registered

trademarks of Intel Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products.

Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.

Model DCTA
July 2006 Rev. A00

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Before You Begin: Dell Dimension E520 Service Manual

Back to Contents Page

Before You Begin

Dell™ Dimension™ E520 Service Manual

Getting Started
Recommended Tools
Turning Off Your Computer
Before Working Inside Your Computer

Getting Started

This manual provides procedures for removing and replacing the components in your computer. Unless otherwise noted, each
procedure assumes that the following conditions exist:

You have performed the steps in Turning Off Your Computer and Before Working Inside Your Computer.
You have read the safety information in your Dell™ Product Information Guide.
A component can be replaced by performing the removal procedure in reverse order.

Recommended Tools

The procedures in this document may require the following tools:

Small flat-blade screwdriver
Phillips screwdriver
Flash BIOS update program (download)

Turning Off Your Computer

NOTICE: To avoid losing data, save and close any open files and exit any open programs before you turn off your

computer.

1. Shut down the operating system:
a. Save and close any open files, exit any open programs, click the Start button, and then click Shutdown.
b. In the Shut Down Windows window, select Shut down.

The computer turns off after the operating system shutdown process finishes.

2. Ensure that the computer and any attached devices are turned off. If your computer and attached devices did not

automatically turn off when you shut down your operating system, press and hold the power button for 4 seconds.

Before Working Inside Your Computer

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Before You Begin: Dell Dimension E520 Service Manual

Use the following safety guidelines to help protect your computer from potential damage and to help ensure your own

personal safety.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card.

Hold a card by its edges or by its metal mounting bracket. Hold a component such as a processor by its
edges, not by its pins.

NOTICE: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is

not authorized by Dell is not covered by your warranty.

NOTICE: When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some

cables have a connector with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs
before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any
connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.

NOTICE: To avoid damaging the computer, perform the following steps before you begin working inside the computer.

1. Turn off your computer. See Turning Off Your Computer

NOTICE: To disconnect a network cable, first unplug the cable from your computer, and then unplug it from the

network port or device.

2. Disconnect any telephone or telecommunication lines from the computer.

3. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to

ground the system board.

.

NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface,

such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to
dissipate any static electricity that could harm internal components.

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About Your Computer: Dell Dimension E520 Service Manual

Back to Contents Page

About Your Computer

Dell™ Dimension™ E520 Service Manual

Front View of the Computer
Back View of the Computer
Back Panel Connectors

Front View of the Computer

1 Service

Tag

2 cover

release
latch

3 CD or DVD

activity
light

4 CD or DVD

eject
button

5 FlexBay Can contain an optional floppy drive or optional Media Card Reader.

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Use the Service Tag to identify your computer when you access the Dell
Support website or contact support.

Use this latch to remove the cover.

The CD or DVD drive light is on when the computer reads data from, or writes
data to the CD or DVD drive.

Press the CD or DVD eject button to eject a disc from the CD or DVD drive.

About Your Computer: Dell Dimension E520 Service Manual

drive

6 vents For adequate cooling, do not block any of the vents.

NOTICE: Ensure that there is a minimum of two inches of space between all

vents and any objects near the vents.

NOTICE: Keep the vent area clean and dust-free to ensure that the system is

adequately ventilated. Use only a dry cloth to clean the vent area to avoid
water damage to the system.

7 USB 2.0

connectors
(2)

8 power

button

9 hard drive

activity
light

10 diagnostic

lights (4)

11 headphone

connector

12 microphone

connector

Use the front USB connectors for devices that you connect occasionally, such
as flash memory keys, cameras, or bootable USB devices. For more
information on booting to a USB device see System Setup Options

NOTE: It is recommended that you use the back USB connectors for devices

that typically remain connected, such as printers and keyboards.
Press the power button to turn on the computer.

NOTICE: To avoid losing data, do not use the power button to turn off the

computer. Instead, perform an operating system shutdown.
The hard drive light is on when the computer reads data from or writes data

to the hard drive. The light may also be on when a device such as a CD player
is operating.

Use the sequence of the diagnostic lights to help you troubleshoot a problem
with your computer (see Diagnostic Lights

Use the headphone connector to attach headphones and most kinds of
speakers.

Use the microphone connector to attach a personal computer microphone for
voice or musical input into a sound or telephony program.

).

.

Back View of the Computer

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About Your Computer: Dell Dimension E520 Service Manual

1 power

connector

2 back I/O

connectors

3 card slots (4) Access connectors for installed PCI or PCI Express cards.

Insert the power cable.

Plug USB, network, VGA monitor, and audio devices into the appropriate
connectors (see Back Panel Connectors

).

Back Panel Connectors

1 link integrity

light

Green — A good connection exists between a 10-Mbps network
and the computer.
Orange — A good connection exists between a 100-Mbps network
and the computer.
Yellow — A good connection exists between a 1000-Mbps (1­Gbps) network and the computer.
Off — The computer is not detecting a physical connection to the
network.

2 network adapter

connector

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NOTICE: Do not plug a telephone cable into the network connector.

About Your Computer: Dell Dimension E520 Service Manual

Use the network adapter connector to attach your computer to a

network or broadband device. Connect one end of a network cable to
either a network jack or your network or broadband device, and then
connect the other end of the network cable to the network adapter
connector on your computer. A click indicates that the network cable
has been securely attached.

On computers with an additional network card, use the connectors on
the card and on the back of the computer when setting up multiple
network connections (such as a separate intra- and extranet).

NOTE: It is recommended that you use Category 5 wiring and

connectors for your network. If you must use Category 3 wiring, force
the network speed to 10 Mbps to ensure reliable operation.

3 network activity

light

4 USB 2.0

connectors (2)
(rear dual)

5 USB 2.0

connectors (4)
(rear quad)

6 surround sound

connector

7 line-in connector Use the (blue) line-in connector to attach a record/playback device such

Flashes a yellow light when the computer is transmitting or receiving
network data. A high volume of network traffic may make this light
appear to be in a steady "on" state.

Use the back, rear-dual USB connectors for devices that typically remain
connected, such as printers and keyboards.

NOTE: It is recommended that you use the front USB connectors for

devices that you connect occasionally, such as joysticks, cameras, or
bootable USB devices.

Use the back, rear-quad USB connectors for devices that typically
remain connected, such as printers and keyboards.

NOTE: It is recommended that you use the front USB connectors for

devices that you connect occasionally, such as joysticks, cameras, or
bootable USB devices.

Use the (black) surround sound connector to attach multichannel­capable speakers.

On computers with a sound card, use the connector on the card.

as a cassette player, CD player, or VCR.
On computers with a sound card, use the connector on the card.

8 line-

out/headphone
connector

9 microphone

connector

10 side surround

sound connector

11 center/subwoofer

LFE connector

Use the (green) line-out connector to attach headphones and most
speakers with integrated amplifiers.

On computers with a sound card, use the connector on the card.
Use the (pink) microphone connector to attach a personal computer

microphone for voice or musical input into a sound or telephony
program.

On computers with a sound card, use the connector on the card.
Use the (gray) side surround sound connector to attach multichannel-

capable speakers. The side-surround output provides enhanced
surround audio for computers with 7.1 speakers.

On computers with a sound card, use the connector on the card.
Use the (orange) center/subwoofer connector to attach a center speaker

or a single subwoofer.
On computers with a sound card, use the connector on the card.

NOTE: The LFE (Low Frequency Effects) Audio channel, found in digital

surround sound audio schemes, carries only low frequency information
of 80 Hz and below. The LFE channel drives a subwoofer to provide
extremely low bass extension. Systems not using subwoofers can shunt
the LFE information to the main speakers in the surround sound setup.

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About Your Computer: Dell Dimension E520 Service Manual

12 VGA connector Use the integrated video connector to attach your video monitor

(optional).
On computers with a video card, use the connector on the card.

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Technical Overview: Dell Dimension E520 Service Manual

Back to Contents Page

Technical Overview

Dell™ Dimension™ E520 Service Manual

Inside View of Your Computer
System Board Components
Power Supply DC Connector Pin Assignments

Inside View of Your Computer

1 power supply 2 system board 3 hard drive
4 floppy drive (optional) or media card reader (optional) 5 CD or DVD drive

System Board Components

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Technical Overview: Dell Dimension E520 Service Manual

1 CPU fan connector 2 processor and heat sink connector 3 processor power

connector

4 memory module

connectors

7 front panel I/O

connector

10 FlexBay USB

connector

13 PCI Express x16

card connector

16 floppy drive

connector (FLOPPY)

5 battery socket (BATTERY) 6 SATA Connectors

SATA0 and SATA1

8 main power connector 9 SATA connectors

SATA4 and SATA5

11 clear CMOS jumper (CLRCMOS) 12 password jumper

(CLRPSWD)

14 PCI Express x1 card connector 15 PCI card connector

17 Standby LED (near blue lever on PCI

Express x16 connector)

Power Supply DC Connector Pin Assignments

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Technical Overview: Dell Dimension E520 Service Manual

DC Power Connector P1

Pin Number Signal Name Color Wire Gauge

1 +3.3 VDC Orange 18-AWG
2 +3.3 VDC Orange 18-AWG
3 COM Black 18-AWG
4 +5 VDC Red 18-AWG
5 COM Black 18-AWG
6 +5 VDC Red 18-AWG
7 COM Black 18-AWG
8 POK Gray 18-AWG
9 +5 VFP Purple 18-AWG

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Technical Overview: Dell Dimension E520 Service Manual

10 +12 VB DC White 18-AWG

11 +12VB DC White 18-AWG
12 +3.3 VDC Orange 18-AWG
13 +3.3 VDC Orange 18-AWG
14 -12 VDC Blue 18-AWG
15 COM Black 18-AWG
16 PS-ON Green 18-AWG
17 COM Black 18-AWG
18 COM Black 18-AWG
19 COM Black 18-AWG
20 N/C N/C 18-AWG
21 +5 VDC Red 18-AWG
22 +5 VDC Red 18-AWG
23 +5 VDC Red 18-AWG
24 COM Black 18-AWG

DC Power Connector P2

Pin Number Signal Name 18-AWG Wire

1 COM Black
2 COM Black
3 +12 VA DC Yellow
4 +12 VA DC Yellow

DC Power Connect P3, P5, P8, and P9

Pin Number Signal Name 18-AWG Wire

1 +3.3 VDC Orange
2 COM Black
3 +5 VDC Red

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Technical Overview: Dell Dimension E520 Service Manual

4 COM Black
5 +12 VB DC White

DC Power Connector P7

Pin Number Signal Name 18-AWG Wire

1 +5 VDC Red
2 COM Black
3 COM Black
4 +12 A VDC Yellow

DC Power Connector P10

Pin Number Signal Name 18-AWG Wire

1 +12 VA DC Yellow
2 COM Black
3 COM Black
4 +5V DC Red

NOTE: The P10 connector is intended for use with PCI Express graphics cards that have power requirements exceeding

75 watts.

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Specifications: Dell Dimension E520 Service Manual

Back to Contents Page

Specifications

Dell™ Dimension™ E520 Service Manual

Processor

Processor type Intel® Pentium® 4

Intel® Pentium® D
Intel® Core™ 2 Duo

NOTE: Not all Pentium 4 processors

support Hyper-Threading technology.
Level 1 (L1) cache 32 KB
Level 2 (L2) cache 1 MB for Pentium 4 5XX processors (with

Hyper Threading)

2 MB for Pentium 4 6XX processors (with

Hyper Threading)

2 x 2 MB for Pentium D 9XX processors

(with dual core)

2 x 1 MB for Pentium D 8XX processors

(with dual core)

256K for Celeron® D 3XX processors

2 MB for Intel Core™ E6400 processors

and earlier

4 MB for Intel Core™ E6600 processors

and later

Memory

Type 533-MHz, 667-MHz, and 800-MHz dual

DDR2 unbuffered SDRAM
Memory connectors four
Memory capacities 256 MB, 512 MB, or 1 GB non-ECC
Maximum memory 4 GB

NOTE: See Addressing Memory With 4-

GB Configurations to verify the amount of

memory available to the operating

system.
BIOS address F0000h

Computer Information

Chipset Intel G965 Express Chipset
RAID Support RAID 1 (Mirroring)
DMA channels eight
Interrupt levels 24

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Specifications: Dell Dimension E520 Service Manual

BIOS chip (NVRAM) 4 MB

NIC integrated network interface capable of

System clock 533-MHz, 800-MHz, or 1066-MHz data

Video

Type integrated Intel® Graphics Media

Audio

Type Sigmatel 9227

Expansion Bus

Bus type PCI 2.3

10/100 communication

rate

Accelerator X3000 (Intel® GMA X3000)

PCI Express

PCI Express x1 and x16
Bus speed PCI: 33 MHz

PCI Express:

x1 slot bidirectional speed - 500
MB/s

x16 slot bidirectional speed - 8
GB/s

PCI

connectors two
connector size 120 pins
connector data width (maximum) 32 bits

PCI Express

connector one x1
connector size 36 pins
connector data width (maximum) 1 PCI Express lane

PCI Express

connector one x16
connector size 164 pins
connector data width (maximum) 16 PCI Express lanes

Drives

Externally accessible:
Bays two 5.25-inch drive bays

one 3.5-inch drive bay (FlexBay)
Available devices Serial ATA drives (4), floppy drive, USB

memory devices, CD/DVD drive, and

Media Card Reader

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Specifications: Dell Dimension E520 Service Manual

Internally accessible: two bays for 1-inch high serial ATA hard

drives

Connectors

External connectors:

Video 15-hole connector
Network adapter RJ-45 connector
USB two front-panel and six back-panel USB

2.0-compliant connectors

Audio six connectors for 7.1 support

System board connectors:

Serial ATA (SATA) four 7-pin connectors
FlexBay Drive one USB 10-pin header (with one pin

removed for keying) for optional Media

Card Reader (3.5-inch bay device)

Floppy drive one 34-pin connector
Fan one 5-pin connector
PCI 2.3 two 120-pin connectors
PCI Express x1 one 36-pin connector
PCI Express x16 one 164-pin connector

Controls and Lights

Power button push button
Power light green light — Blinking green in sleep

state; solid green for power-on state.

amber light — Blinking amber indicates a

problem with the power supply inside the

computer. If the system cannot boot and

there is a solid amber light, a problem

with the system board may exist (see

Power Lights

Hard drive access light green
Link integrity light (on integrated network

adapter)

green light — A good connection exists

between the network and the computer.

off (no light) — The computer is not

detecting a physical connection to the

network.

).

Activity light (on integrated network
adapter)

Diagnostic lights four lights on the front panel (see

Standby power light STBYLED on the system board

Power

DC power supply:

Wattage 305 W

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yellow blinking light

Diagnostic Lights

)

Specifications: Dell Dimension E520 Service Manual

Maximum heat dissipation 1040 BTU/hr

Voltage (see the safety instructions
located in the Product Information
Guide for important voltage setting

Manually selectable: 90 to 135 V and 180

to 265 V at 50/60 Hz

information)

Backup battery 3-V CR2032 lithium coin cell

Physical

Height 41.4 cm (16.3 inches)
Width 18.8 cm (7.4 inches)
Depth 45.7 cm (18.0 inches)
Weight 12.7 kg (28.0 lb)

Environmental

Temperature:

Operating 10° to 35°C (50° to 95°F)

Storage –40° to 65°C (–40° to 149°F)
Relative humidity 20% to 80% (noncondensing)
Maximum vibration:

Operating

Storage
Maximum shock:

Operating 40 G +/- 5% with pulse duration of 2

Storage 105 G +/- 5% with pulse duration of 2

Altitude:

Operating –15.2 to 3048 m (–50 to 10,000 ft)

Storage –15.2 to 10,668 m (–50 to 35,000 ft)

Back to Contents Page

2

5 to 350 Hz at 0.0002 G
5 to 500 Hz at 0.001 to 0.01 G

/Hz

2

/Hz

msec +/- 10% (equivalent to 20 in/sec
[51 cm/sec])

msec +/- 10% (equivalent to 50 in/sec
[127 cm/sec])

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Advanced Troubleshooting: Dell Dimension E520 Service Manual

Back to Contents Page

Advanced Troubleshooting

Dell™ Dimension™ E520 Service Manual

Power Lights
Diagnostic Lights
Beep Codes
System Messages
Dell Diagnostics
Drivers
Resolving Software and Hardware Incompatibilities

Power Lights

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

The power button light located on the front of the computer illuminates and blinks or remains solid to indicate different states:

If the power light is green and the computer is not responding:

Ensure the display is connected and powered on.
If the display is connected and powered on see Diagnostic Lights.

If the power light is blinking green, the computer is in standby mode. Press a key on the keyboard, move the mouse,
or press the power button to resume normal operation.

If the power light is off, the computer is either turned off or is not receiving power.

Reseat the power cable in the power connector on the back of the computer and the electrical outlet.
If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and

that the power strip is turned on. Also, bypass power protection devices, power strips, and power extension
cables to verify that the computer turns on properly.

Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
Ensure that the main power cable and front panel cable are securely connected to the system board (see System

Board Components).

If the power light is blinking amber, the computer is receiving electrical power, but an internal power problem might
exist.

Ensure that the voltage selection switch is set to match the AC power at your location (if applicable).

If the power light is steady amber, a device might be malfunctioning or incorrectly installed.

Remove and then reinstall the memory modules (see Memory).
Remove and then reinstall any cards (see Cards).
Remove and then reinstall the graphics card, if applicable (see Cards).
Ensure that all power cables are securely connected to the system board (see System Board Components).

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Advanced Troubleshooting: Dell Dimension E520 Service Manual

Diagnostic Lights

CAUTION: Before you perform any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

To help you troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel (see Front View of

the Computer). When the computer starts normally, the lights flash before turning off. If the computer malfunctions, the

sequence of the lights helps to identify the problem.
.

Light Pattern Problem Description Suggested Resolution

The computer is in a
normal "off" condition or
a possible pre-BIOS
failure has occurred.

All four diagnostic lights
display solid green and
then turn off after the
system successfully boots
to the operating system.

A possible processor
failure has occurred.

Memory modules are
detected, but a memory
failure has occurred.

Plug the computer into a working electrical outlet (see Power Lights).
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

Reseat the processor (see Processor).
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

If two or more memory modules are installed, remove the modules
(see Removing Memory

Memory) and restart the computer. If the computer starts normally,

continue to install additional memory modules (one at a time) until you
have identified a faulty module or reinstalled all modules without
error.
If available, install properly working memory of the same type into
your computer (see Installing Memory
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

), then reinstall one module (see Installing

).

A possible graphics card
failure has occurred.

A possible floppy drive or
hard drive failure has
occurred.

A possible USB failure
has occurred.

No memory modules are
detected.

Memory modules are
detected, but a memory
configuration or

Reseat any installed graphics cards (see Cards).
If available, install a working graphics card into your computer.
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

Reseat all power and data cables.

Reinstall all USB devices and check all cable connections.

If two or more memory modules are installed, remove the modules
(see Removing Memory

Memory) and restart the computer. If the computer starts normally,

continue to install additional memory modules (one at a time) until you
have identified a faulty module or reinstalled all modules without
error.
If available, install properly working memory of the same type into
your computer (see Installing Memory
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

Ensure that no special requirements for memory module/connector
placement exist (see Memory
Ensure that the memory you are using is supported by your computer

), then reinstall one module (see Installing

).

).

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Advanced Troubleshooting: Dell Dimension E520 Service Manual

compatibility error has

(see Memory).

occurred.

A possible expansion card
failure has occurred.

The system is operating
in quick resume mode.

Another failure has
occurred.

If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

1. Determine if a conflict exists by removing an expansion card (not a
graphics card) and restarting the computer (see Cards

2. If the problem persists, reinstall the card you removed, then remove a
different card and restart the computer.

3. Repeat this process for each card installed. If the computer starts
normally, troubleshoot the last card removed from the computer for
resource conflicts (see Resolving Software and Hardware

Incompatibilities).

4. If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

Press the power button
Move the mouse
Press any key on the keyboard
Press any key on the optional MCE remote control

Ensure that all hard drive and CD/DVD drive cables are properly
connected to the system board (see Drives
If there is an error message on your screen identifying a problem with
a device (such as the floppy drive or hard drive), check the device to
make sure it is functioning properly.
If the operating system is attempting to boot from a device (such as
the floppy drive or hard drive), check system setup (see System

Setup) to make sure the boot sequence is correct for the devices

installed on your computer.
If the problem persists, contact Dell (see "Contacting Dell" in your
Owner's Manual).

).

).

Beep Codes

Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of
beeps, called a beep code, identifies a problem. For example, beep code 1-3-1 (one possible beep code) consists of one beep,
a burst of three beeps, and then one beep. This beep code tells you that the computer encountered a memory problem.

Reseating the memory modules (see Installing Memory
see "Contacting Dell" in your Owner's Manual for instructions on obtaining technical assistance.

Code Cause

1-3-1 through 2-4-4 Memory not being properly identified or used
4-3-1 Memory failure above address 0FFFFh

If you experience any of the following non-memory related beep code errors, see "Contacting Dell" in your Owner's Manual
for instructions on obtaining technical assistance.

Code Cause

1-1-2 Microprocessor register failure
1-1-3 NVRAM
1-1-4 ROM BIOS checksum failure
1-2-1 Programmable interval timer

) may correct the following beep code errors. If the problem persists,

1-2-2 DMA initialization failure
1-2-3 DMA page register read/write failure

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State Low

3-1-1 Slave DMA register failure
3-1-2 Master DMA register failure
3-1-3 Master interrupt mask register failure
3-1-4 Slave interrupt mask register failure
3-2-2 Interrupt vector loading failure
3-2-4 Keyboard Controller Test failure
3-3-1 NVRAM power loss
3-3-2 NVRAM configuration
3-3-4 Video Memory Test failure
3-4-1 Screen initialization failure
3-4-2 Screen retrace failure
3-4-3 Search for video ROM failure
4-2-1 No time tick
4-2-2 Shutdown failure
4-2-3 Gate A20 failure
4-2-4 Unexpected interrupt in protected mode
4-3-3 Timer-chip counter 2 failure
4-3-4 Time-of-day clock stopped
4-4-1 Serial or parallel port test failure
4-4-4 Cache test failure

System Messages

NOTE: If the message you received is not listed in the table, see the documentation for either the operating system or

the program that was running when the message appeared.

Message Possible Cause Corrective Action

8042 Gate­A20 error

Address Line
Short!

C: Drive
Error

C: Drive
Failure

Cache
Memory Bad,
Do Not
Enable
Cache

CH-2 Timer
Error

CMOS Battery

The keyboard controller
failed its test.

An error in the address
decoding circuitry in the
memory has occurred.

The hard drive is not
working or is not
configured correctly.

The cache memory is not
operating.

An error is occurring on
the timer on the system
board.

The system configuration Enter the system setup program (see Entering

If you receive this message after you make changes
in the system setup program, enter the system
setup program (see Entering System Setup
restore the original value(s).

Reseat the memory modules (see Memory

Ensure that the drive is installed correctly in the
computer and defined correctly in the system setup
program (see Entering System Setup

See "Contacting Dell" in your Owner's Manual for
instructions on obtaining technical assistance.

See "Contacting Dell" in your Owner's Manual for
instructions on obtaining technical assistance.

) and

).

).

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information in the system

System Setup), verify the system configuration,

CMOS
Checksum
Failure

CMOS System
Options Not
Set

CMOS Display
Type
Mismatch

CMOS Memory
Size
Mismatch

CMOS Time
and Date Not
Set

Diskette
Boot Failure

DMA Error
DMA 1 Error
DMA 2 Error

FDD
Controller
Failure

HDD
Controller
Failure

INTR1 Error
INTR2 Error

Invalid Boot
Diskette

Keyboard
Error

KB/Interface
Error

No ROM
Basic

setup program is incorrect
or the battery charge may
be low.

Drive A or B is present
but has failed the BIOS
POST.

Error in the DMA
controller on the system
board.

The BIOS cannot
communicate with the
floppy drive or hard drive
controller.

An interrupt channel on
the system board failed to
POST.

The operating system
cannot be located on drive
A or drive C.

The BIOS has detected a
stuck key.

An error occurred with the
keyboard connector.

The operating system
cannot be located on drive
A or drive C.

and then restart the computer.

Ensure that the drive is installed correctly in the
computer and defined correctly in the system setup
program (see Entering System Setup
interface cable at both ends.

The keyboard or system board may need to be
replaced.

Ensure that the floppy drive or the hard drive is
installed correctly in the computer (see Drives
defined correctly in the system setup program (see

Entering System Setup

at both ends.
The keyboard or system board may need to be

replaced.

Enter the system setup program (see Entering

System Setup)and confirm that drive A or drive C

is properly identified.
Ensure that nothing is resting on the keyboard; if a

key appears to be stuck, carefully pry it up. If the
problem persists, you may need to replace the
keyboard.

Ensure that nothing is resting on the keyboard; if a
key appears to be stuck, carefully pry it up. If the
problem persists, you may need to replace the
keyboard.

Enter the system setup program (see Entering

System Setup) and confirm that drive A or drive C

is properly identified.

). Check the interface cable

). Check the

) and

Dell Diagnostics

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

NOTE: The Dell Diagnostics only operate on Dell computers.

Starting the Dell Diagnostics

1. Turn on (or restart) your computer.

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2. When the DELL logo appears, press <F12> immediately.

3. At the Boot Device Menu, use the up- and down-arrow keys or press the appropriate number on the keyboard to

4. At the Dell Diagnostics Main Menu, left-click with the mouse, or press <Tab> and then <Enter>, to select the test you

5. After all tests have completed, close the test window to return to the Dell Diagnostics Main Menu.

6. Close the Main Menu window to exit the Dell Diagnostics and restart the computer.

NOTE: Keyboard failure may result when a key is held down for extended periods of time. To avoid possible

keyboard failure, press and release <F12> in even intervals to open the Boot Device Menu.

If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows®
desktop, then shut down your computer and try again.

highlight Boot to Utility Partition, and then press <Enter>.

NOTE: The Quickboot feature changes the boot sequence for the current boot only. Upon restart, the computer

boots according to the boot sequence specified in system setup.

want to run (see Dell Diagnostics Main Menu

NOTE: Write down any error codes and problem descriptions exactly as they appear and follow the instructions

on the screen.

).

Dell Diagnostics Main Menu

The following tests can be run from the Dell Diagnostics Main Menu:

Option Function

Express
Test

Extended
Test

Custom
Test

Symptom
Tree

For any problem encountered during a test, a message appears with an error code and a description of the problem. Write
down the error code and problem description exactly as it appears and follow the instructions on the screen. If you cannot
resolve the problem, see "Contacting Dell" in your Owner's Manual for instructions on obtaining technical assistance.

NOTE: The Service Tag for your computer is located at the top of each test screen. When contacting Dell support, have

your Service Tag ready.

The following tabs provide additional information for tests run from the Custom Test or Symptom Tree option:

Performs a quick test of system devices. The test typically takes 10 to 20 minutes and requires no interaction on
your part. Run Express Test first to increase the possibility of tracing the problem quickly.

Performs a thorough check of system devices. The test typically takes an hour or more and peridocially requires
your input to answer specific questions.

Tests a specific device in the system and can be used to customize the tests you want to run.

Lists a number of common symptoms and allows you to select a test based on the symptom of the problem you
are having.

Tab Function

Results Displays the results of the test and any error conditions encountered.
Errors Displays error conditions encountered, error codes, and the problem description.
Help Describes the test and any requirements for running the test.
Configuration Displays the hardware configuration for the selected device.

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(Custom
Test
only)

Parameters

(Custom
Test
only)

The Dell Diagnostics obtains configuration information for all devices from system setup, memory, and
various internal tests, and it displays the information in the device list in the left pane of the screen.

NOTE: The device list may not display the names of all the components installed on your computer or all

devices attached to your computer.
Allows you to customize the test, if applicable, by changing the test settings.

Drivers

What Is a Driver?

A driver is a program that controls a device such as a printer, mouse, or keyboard. All devices require a driver program.
A driver acts as a translator between the device and any other programs that use the device. Each device has its own set of

specialized commands that only the driver for that device recognizes.
Required drivers are already installed on your computer—no further installation or configuration is needed.

®

Many drivers, such as the keyboard driver, come with your Microsoft
drivers if you:

Upgrade your operating system.
Reinstall your operating system.
Connect or install a new device.

Windows® operating system. You may need to install

Identifying Drivers

If you experience a problem with any device, identify whether the driver is the source of your problem and, if necessary,
update the driver.

Windows XP

1. Click the Start button, then click Control Panel.

2. Under Pick a Category, click Performance and Maintenance.

3. Click System.

4. In the System Properties window, click the Hardware tab.

5. Click Device Manager.

6. Scroll down the list of devices and check for an exclamation point (a circle with a [!]) next to the device name.

If an exclamation point appears next to the device name, you may need to reinstall the driver or install a new driver.

Reinstalling Drivers

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NOTICE: The Dell Support website at support.dell.com provides approved drivers for your Dell™ computer. If you

install drivers obtained from other sources, your computer may not function properly.

Using Windows XP Device Driver Rollback

If a problem occurs on your computer after you install or update a driver, use Windows XP Device Driver Rollback to replace
the driver with the previously installed version.

1. Click Start, then click Control Panel.

2. Under Pick a Category, click Performance and Maintenance.

3. Click System.

4. In the System Properties window, click the Hardware tab.

5. Click Device Manager.

6. Right-click the device for which the new driver was installed, then click Properties.

7. Click the Driver tab.

8. Click Roll Back Driver.

Manually Reinstalling Drivers

After copying driver files to your hard drive, you may be required to update the driver manually.

NOTE: Drivers can be manually updated for any hardware device installed in your computer.

1. Click Start, then click Control Panel.

2. Under Pick a Category, click Performance and Maintenance.

3. Click System.

4. In the System Properties window, click the Hardware tab.

5. Click Device Manager.

6. Double-click the type of device for which you are installing the driver.

7. Right-click the device for which the driver is being reinstalled, then click Properties.

8. Click the Driver tab.

9. Click Update Driver.

10. Click Install from a list or specific location (Advanced), then click Next.

11. Click to check Include this location in the search, then click Browse and navigate to where the driver files are
located on your hard drive.

12. When the name of the appropriate driver appears, click Next.

13. Click Finish and restart your computer.

Resolving Software and Hardware Incompatibilities

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If a device is not detected during the operating system setup or is detected but incorrectly configured, you can use the

Hardware Troubleshooter to resolve the incompatibility.
To resolve incompatibilities using the Hardware Troubleshooter:

1. Click Start, then click Help and Support.

2. Type hardware troubleshooter in the Search field, then click the arrow to start the search.

3. Click Hardware Troubleshooter in the Search Results list.

4. In the Hardware Troubleshooter list, click I need to resolve a hardware conflict on my computer, and then
click Next.

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System Setup: Dell Dimension E520 Service Manual

Back to Contents Page

System Setup

Dell™ Dimension™ E520 Service Manual

Overview
Entering System Setup
System Setup Options
Boot Sequence
Clearing Forgotten Passwords
Clearing CMOS Settings
Flashing the BIOS

Overview

Use system setup as follows:

To change the system configuration information after you add, change, or remove any hardware in your computer
To set or change a user-selectable option, such as the user password
To read the current amount of memory or set the type of hard drive installed

Before you use system setup, it is recommended that you write down the system setup screen information for future
reference.

NOTICE: Do not change the settings in system setup unless you are an expert computer user. Certain changes can

cause your computer to work incorrectly.

Entering System Setup

1. Turn on (or restart) your computer.

2. When the DELL logo appears, press <F2> immediately.

NOTE: Keyboard failure may result when a key on the keyboard is held down for extended periods of time. To

avoid possible keyboard failure, press and release <F2> in even intervals until the system setup screen appears.

If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows®
desktop, then shut down your computer and try again.

System Setup Screens

The system setup screen displays current or changeable configuration information for your computer. Information on the
screen is divided into three areas: the options list, active options field, and key functions.

Option Field — This field contains
information about each option. In
this field you can view and make
changes to your current settings.

Use the right- and left-arrow keys

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to highlight an option. Press

Options List — This field appears on the left side of the system setup window. The
field is a scrollable list containing features that define the configuration of your
computer, including installed hardware, power conservation, and security features.

<Enter> to make that selection
active.

Scroll up and down the list with the up- and down-arrow keys. As an option is
highlighted, the Option Field displays more information about that option and the
option's current and available settings. By pressing <Enter> or the right- and left­arrow keys, you can toggle between a primary topic (collapsed) and subtopics
(expanded).

Key Functions — This field
appears below the Option Field
and lists keys and their functions
within the active system setup
field.

System Setup Options

NOTE: Depending on your computer and installed devices, the items listed in this section may not appear, or may not

appear exactly as listed.

System

System
Info

CPU Info

Memory
Info

Date/Time

Boot
Sequence

Drives

Diskette
Drive

SATA 0
through
5

Lists system information such as the computer name, the BIOS version number and date, system tags, and
other system-specific information.

NOTE: The system name listed in the BIOS may not appear exactly as the name that appears on the computer

or in the computer's documentation.
Lists the processor type, processor bus speed, processor ID, clock speed, L2 cache, and additional features

supported by your processor.
Indicates the type and amount of installed memory, memory speed and channel mode (dual or single).
Displays current date and time settings.

The computer attempts to boot from the sequence of devices specified in this list.

NOTE: If you insert a boot device and restart the computer, the device appears in the system setup menu. To

boot from a USB memory device, select the USB device and move it (by pressing <U>) so that it becomes the
first device in the list.

Identifies and defines the floppy drive attached to the FLOPPY connector on the system board. The options
restrict identification of drives to USB only, Internal only, or none (Off). The Read Only option restricts the
ability to boot from any floppy device.

Identifies the drives attached to the SATA connectors on the system board, and lists the capacity for hard
drives.

NOTE: SATA2 and SATA3 positions are not supported in this system.

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SATA

Identifies and defines the SATA controller settings for RAID. You can set the SATA controller to RAID

Disable

Operation

Onboard Devices

Integrated
NIC

Integrated
Audio

USB
Controller

USB for
FlexBay

Rear Quad
USB

Rear Dual
USB

Front USB

Autodetect/ATA or RAID On.

You can set the NIC to On (default), Off, or On w/PXE. When the On w/PXE setting is active (available
only for the future boot process), the computer prompts you to press <Ctrl><Alt><b>. Pressing this key
combination causes a menu to display that allows you to select a method for booting from a network server.
If a boot routine is not available from the network server, the computer attempts to boot from the next device
in the boot sequence list.

Enables or disables the onboard audio controller.

Set to On (default) so that USB devices will be detected and supported in the operating system.
This field enables and disables the internal USB for FlexBay.

Off — Internal USB for FlexBay is disabled.
On — Internal USB for FlexBay is enabled.
No Boot (default) — Internal USB for FlexBay is enabled but not bootable.

NOTE: This USB option appears only if a FlexBay device is installed.

Enables or disables the four-stacked USB ports on the back of the computer.

Enables or disables the two-stacked USB ports on the back of the computer.
Enables or disables the two USB ports on the front of the computer.

Video

Primary
Video

Performance

Multiple CPU
Core

Virtualization

SpeedStep

HyperThreading

HDD Acoustic
Mode

Security

This setting specifies which video controller is primary when two video controllers are present on the
computer.

If your computer processor supports more than one core, this option appears in the Options List.
If your computer processor supports virtual technology, this option appears in the Options List.

If your computer processor supports Intel® SpeedStep® technology, then this option is listed and it
allows you to enable or disable support for this feature.

If your computer processor supports Hyper-Threading, this option appears in the Options List.

Bypass (default) — Your computer does not test or change the current acoustics mode setting.
Quiet — The hard drive operates at its most quiet setting.
Suggested — The hard drive operates at the level suggested by the drive manufacturer.
Performance — The hard drive operates at its maximum speed.

NOTE: Switching to performance mode will cause the drive heads to move faster, causing the hard drive

to be noisier. However, some drives may not see an increase in data transfer rates.

NOTE: Changing the acoustics setting does not alter your hard drive image.

Admin
Password

System
Password

Password
Status

Execute

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This option provides restricted access to the computer's system setup program in the same way that access to
the system can be restricted with the System Password option.

Displays the current status of the system's password security feature and allows a new system password to be
assigned and verified.

This option locks the system password field with the setup password. When the field is locked, you can no longer
disable password security by pressing <Ctrl><Enter> when the computer starts.

Specifies whether Execute Disable Memory Protection Technology will be on or off.

System Setup: Dell Dimension E520 Service Manual

Power Management

AC
Recovery

Auto
Power
On

Auto
Power
Time

Determines what happens when AC power is restored to the computer.
Sets the computer to automatically turn on. Choices are every day or every Monday through Friday.
The default setting is Off.
This feature does not work if you turn off your computer using a power strip or surge protector.

Sets time to automatically turn on the computer.
Time is kept in the standard 12-hour format (hours:minutes). Change the startup time by pressing the right- or

left-arrow key to increase or decrease the numbers, or type numbers in both the date and time fields.
This feature does not work if you turn off your computer using a power strip or surge protector.

This option allows the computer to power up when a NIC or Remote Wakeup-capable modem receives a wake
up signal.

Remote
Wake Up

Suspend
Mode

Quick
Resume

Maintenance

Service Tag
SERR Message
Load Defaults
Event Log

POST Behavior

Fastboot

Numlock
Key

POST
Hotkeys

Keyboard
Errors

On is the default setting. On w/Boot to NIC allows the computer to attempt to boot from a network prior to
using the boot sequence.

NOTE: Normally, the system can be powered up remotely from suspend mode, hibernate mode, or when

powered off.
The options are S1, a suspend state where the computer is running in a low-power mode, and S3, a standby

state where the power is reduced or turned off for most components, but system memory remains active.
This feature enables/disables the Intel® Viiv™ Quick Resume Technology.

The default setting is Off.

When set to On (default), your computer starts more quickly by skipping certain configurations and tests.
This option involves the rightmost bank of keys on your keyboard. When set to On (default), this option

activates the numeric and mathematical features shown at the top of each key. When set to Off, this option
activates the cursor-control functions labeled on the bottom of each key.

This option allows you to specify the function keys to display on the screen when the computer starts.

This option disables or enables keyboard error reporting when the computer starts.

Displays the system service tag which is a unique, seven-digit alphanumeric system identifier.
Controls SERR message mechanism to support some add-in cards.
Allows you to reset all options in the setup menu to the factory default.
Displays the system event log.

Boot Sequence

This feature allows you to set the order in which the BIOS will search devices when trying to find an operating system.

NOTICE: If you modify any boot sequence settings, save the new settings to avoid losing the changes.

Option Settings

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NOTE: The computer attempts to boot from all bootable devices, but if no bootable device is found, the computer

generates an error message that states No boot device available. Press the <F1> key to retry the boot, or press the
<F2> key to enter the setup utility.

Onboard or USB Floppy Drive — The computer attempts to boot from the floppy drive. If there is no floppy in the
drive or there is no floppy drive installed, the computer attempts to boot from the next bootable device in the
sequence.

NOTE: If there is a non-bootable floppy in the drive, the computer generates an error message. Follow the on-

screen instructions to retry the boot.

Onboard SATA Hard Drive — The computer attempts to boot from the primary hard drive. If no operating system is
on the drive, the computer attempts to boot from the next bootable device.

Onboard or USB CD-ROM Drive — The computer attempts to boot from the CD drive. If no CD is in the drive, or if
the CD has no operating system, the computer attempts to boot from the next bootable device.

USB Device — Insert the memory device into a USB port and restart the computer. When F12 = Boot Menu appears in
the upper-right corner of the screen, press <F12>. The BIOS detects the device and adds the USB option to the boot
menu.

NOTE: To boot to a USB device, the device must be bootable. To ensure that your device is bootable, check the

device documentation.

Changing Boot Sequence for the Current Boot

You can use this feature, for example, to restart your computer to a USB device, such as a floppy drive, memory key, CD-RW
drive, or PXE (NIC).

NOTE: If you are booting to a USB floppy drive, you must first set the floppy drive to OFF in system setup (see System

Setup Options).

1. If you are booting to a USB device, connect the USB device to a USB connector (see Front View of the Computer

2. Turn on (or restart) your computer.

3. When the DELL logo appears, press <F12> immediately.

NOTE: Keyboard failure may result when a key on the keyboard is held down for extended periods of time. To

avoid possible keyboard failure, press and release <F12> in even intervals until the Boot Device Menu appears.

If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft Windows
desktop, then shut down your computer and try again.

4. At the Boot Device Menu, use the up- and down-arrow keys or press the appropriate number on the keyboard to
highlight the device that is to be used for the current boot only, and then press <Enter>.

For example, if you are booting to a USB memory key, highlight USB Flash Device and press <Enter>.

).

NOTE: To boot to a USB device, the device must be bootable. To make sure your device is bootable, check the device

documentation.

Changing Boot Sequence for Future Boots

1. Enter system setup (see Entering System Setup).

2. Use the arrow keys to highlight the Boot Sequence menu option, then press <Enter> to access the menu.

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NOTE: Write down your current boot sequence in case you want to restore it.

3. Press the up- and down-arrow keys to move through the list of devices.

4. Press the spacebar to enable or disable a device. Enabled devices have a number assigned to them; disabled devices
have no number assigned.

5. Press <U> or <D> to move a selected device up or down the list.

Clearing Forgotten Passwords

CAUTION: Before you perform any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

1. Follow the procedures in Before Working Inside Your Computer

2. Remove the computer cover (see Removing the Computer Cover

3. Locate the 2-pin password jumper (CLRPSWD) on the system board (see System Board Components), and remove the
jumper to clear the password.

.

).

NOTE: When you receive your computer, the jumper plug is attached to pins 1 and 2.

4. Replace the computer cover (see Replacing the Computer Cover

5. Connect your computer and monitor to electrical outlets, and then turn them on.

6. After the Microsoft® Windows® desktop appears on your computer, shut down the computer (see Turning Off Your

Computer).

7. Turn off the monitor and disconnect it from the electrical outlet.

8. Disconnect the computer power cable from the electrical outlet, then press the power button to ground the system
board.

9. Remove the computer cover (see Removing the Computer Cover

10. Locate the 2-pin password jumper (CLRPSWD) on the system board (see System Board Components
jumper to pins 1 and 2 to re-enable the password feature.

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).

).

) and attach the

System Setup: Dell Dimension E520 Service Manual

11. Replace the computer cover (see Replacing the Computer Cover).

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

12. Connect your computer and devices to electrical outlets, and then turn them on.

Clearing CMOS Settings

CAUTION: Before you perform any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

1. Follow the procedures in Before Working Inside Your Computer

2. Remove the computer cover (see Removing the Computer Cover

3. Reset the current CMOS settings:
a. Locate the 2-pin CMOS jumper (CLRCMOS) on the system board (see System Board Components

NOTE: When you receive your computer, there is no jumper plug on the CMOS jumper.

b. Remove the jumper plug from the password jumper (CLRPSWD) pins 1 and 2.

c. Place the jumper plug on the CMOS jumper (CLRCMOS) pins 1 and 2 and wait approximately five seconds.

d. Remove the jumper plug and replace it on the password jumper (CLRPSWD) pins 1 and 2.

4. Replace the computer cover (see Replacing the Computer Cover

NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.

5. Connect your computer and devices to electrical outlets, and then turn them on.

.

).

).

).

Flashing the BIOS

The BIOS may require flashing when an update is available or when replacing the system board.

1. Turn on the computer.

2. Locate the BIOS update file for your computer at support.dell.com.

3. Click Download Now to download the file.

4. If the Export Compliance Disclaimer window appears, click Yes, I Accept this Agreement.

The File Download window appears.

5. Click Save this program to disk, and then click OK.

The Save In window appears.

6. Click the down arrow to view the Save In menu, select Desktop, and then click Save.

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The file downloads to your desktop.

7. Click Close when the Download Complete window appears.

The file icon appears on your desktop and is titled the same as the download BIOS update file.

8. Double-click the file icon on the desktop and follow the on-screen instructions.

Back to Contents Page

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Removing and Installing Parts: Dell Dimension E520 Service Manual

Back to Contents Page

Removing and Installing Parts

Dell™ Dimension™ E520 Service Manual

Removing the Computer Cover
Inside View of Your Computer
System Board Components
Memory
Cards
Drive Panel
Drives
Hard Drive
Floppy Drive

This chapter provides procedures for removing and installing the components in your computer. Unless otherwise noted, each
procedure assumes that the following conditions exist:

You have performed the steps in Turning Off Your Computer and Before Working Inside Your Computer.
You have read the safety information in your Dell™ Product Information Guide.
A component can be installed by performing the removal procedure in reverse order.
You have the tools listed in Recommended Tools.

Media Card Reader
CD/DVD Drive
Battery
Power Supply
Processor
I/O Panel
Processor Fan
System Board
Replacing the Computer Cover

Removing the Computer Cover

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

removing the cover.

CAUTION: When working inside the computer, be aware that the heat sink assembly, power supply, and

other components may be very hot during normal operation. Be sure that components have had sufficient
time to cool before you touch them.

1. Follow the procedures in Before You Begin

NOTICE: Ensure that sufficient space exists to support the removed cover—at least 30 cm (1 ft) of desk top space.

NOTICE: Ensure that you are working on a level, protected surface to avoid scratching either the computer or the

surface on which it is resting.

2. Lay your computer on its side with the computer cover facing up.

3. Pull back the cover release latch located on the top panel.

.

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1 cover latch release 2 computer cover 3 back of computer
4 bottom hinges

4. Locate the three hinge tabs on the bottom edge of the computer.

5. Grip the sides of the computer cover and pivot the cover up, using the bottom hinges as leverage points.

6. Release the cover from the hinge tabs and set it aside.

Inside View of Your Computer

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

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1 floppy drive 2 CD or DVD drive 3 power supply
4 system board 5 processor shroud and heat sink 6 processor fan
7 hard drive

System Board Components

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1 processor fan connector

(CPUFAN)

4 memory module

connectors (2,4)

7 SATA connector (SATA1) 8 SATA connector (SATA0) 9 front-panel connector

10 power connector (POWER) 11 line-in, line-out, microphone,

13 SATA connector (SATA5)* 14 video connector (VGA) 15 Media Card Reader

16 USB connectors (4)

(USBBACK)

19 clear CMOS jumper

(CLRCMOS)

22 PCI connector (SLOT4) 23 PCI connector (SLOT3) 24 floppy drive connector

25 Standby LED (near blue

lever on PCI Express x16
connector)

2 processor connector (CPU) 3 power connector

(POWER12V)

5 memory module connectors

(1,3)

side surround, center, and LFE
connectors

17 network connector (NIC) and

USB connectors (2) (USB2)

20 PCI Express x16 connector

(SLOT1)

* There is no SATA2

6 battery socket

(BATTERY)

(FRNTPANEL)

12 SATA connector

(SATA4)*

connector

18 password jumper

(CLRPSWD)

21 PCI Express x1

connector (SLOT2)

(FLOPPY)

or SATA3 connector
on system board

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Memory

You can increase your computer memory by installing memory modules on the system board.
Your computer supports DDR2 memory. For additional information on the type of memory supported by your computer, see

Memory

DDR2 Memory Overview

DDR2 memory modules should be installed in pairs of matched memory size, speed, and technology. If the DDR2 memory
modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance.
See the label on the module to determine the module's capacity.

.

NOTE: Always install DDR2 memory modules in the order indicated on the system board.

The recommended memory configurations are:

A pair of matched memory modules installed in DIMM connectors 1 and 2

or

A pair of matched memory modules installed in DIMM connectors 1 and 2 and another matched pair installed in
DIMM connectors 3 and 4

NOTICE: Do not install ECC or buffered memory modules. Only unbuffered, non-ECC memory is supported.

If you install mixed pairs of DDR2 533-MHz and DDR2 667-MHz memory, the modules function at the slowest speed
installed.

Be sure to install a single memory module in DIMM connector 1, the connector closest to the processor, before you
install modules in the other connectors.

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1 Channel A: matched pair of memory

modules in connectors DIMM_1 and DIMM_2
(white securing clips)

NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them

separate from any new modules that you may have, even if you purchased the new modules from Dell. If possible, do
not pair an original memory module with a new memory module. Otherwise, your computer may not start properly.
You should install your original memory modules in pairs either in DIMM connectors 1 and 2 or DIMM connectors 3 and

4.

NOTE: Memory purchased from Dell is covered under your computer warranty.

2 Channel B: matched pair of memory

modules in connectors DIMM_3 and
DIMM_4 (black securing clips)

Addressing Memory With 4-GB Configurations

Your computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current 32-bit operating systems,
such as Microsoft® Windows® XP, can use a maximum of 4 GB of address space; however, the amount of memory available

to the operating system is less than that installed. Certain components within the computer require address space in the 4-GB
range. Any address space reserved for these components cannot be used by computer memory.

Installing Memory

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body

before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface
on the computer chassis.

1. Follow the procedures in Before You Begin

2. Remove the computer cover (see Removing the Computer Cover

3. Press out the securing clip at each end of the memory module connector.

.

).

1 memory connector closest to processor 2 securing clips (2) 3 connector

4. Align the notch on the bottom of the module with the crossbar in the connector.

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1 cutouts (2) 2 memory module 3 notch
4 crossbar

NOTICE: To avoid damage to the memory module, press the module straight down into the connector while you apply

equal force to each end of the module.

5. Insert the module into the connector until the module snaps into position.

If you insert the module correctly, the securing clips snap into the cutouts at each end of the module.

6. Replace the computer cover (see Replacing the Computer Cover).

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

7. Connect your computer and devices to electrical outlets and turn them on.

8. Right-click the My Computer icon and click Properties.

9. Click the General tab.

10. To verify that the memory is installed correctly, check the amount of memory (RAM) listed.

Removing Memory

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body

before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface
on the computer chassis.

1. Follow the procedures in Before You Begin

.

2. Remove the computer cover (see Removing the Computer Cover

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).

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3. Press out the securing clip at each end of the memory module connector.

4. Grasp the module and pull up.

If the module is difficult to remove, gently ease the module back and forth to remove it from the connector.

Cards

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body

before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface
on the computer chassis.

Your Dell™ computer provides the following slots for PCI and PCI Express cards:

Two PCI card slots
One PCI Express x16 card slot
One PCI Express x1 card slot

PCI Cards

Your computer supports two PCI cards.

If you are installing or replacing a card, follow the procedures in the next section. If you are removing but not replacing a PCI
card, see Removing a PCI Card

If you are replacing a card, remove the current driver for the card from the operating system.
If you are installing or replacing a PCI Express card, see Installing a PCI Express Card

Installing a PCI Card

1. Follow the procedures in Before You Begin.

.

.

2. Remove the computer cover (see Removing the Computer Cover

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1 release tab 2 card retention door

3. Gently push the release tab on the card retention door from the inside to pivot the door open. The door is hinged and

will remain in the open position.

4. If you are installing a new card, remove the filler bracket to create a card-slot opening. Then continue with step 6

5. If you are replacing a card that is already installed in the computer, remove the card.

Disconnect any cables connected to the card. Grasp the card by its top corners, and ease it out of its connector.

6. Prepare the card for installation.

See the documentation that came with the card for information on configuring the card, making internal connections, or
otherwise customizing it for your computer.

CAUTION: Some network adapters automatically start the computer when they are connected to a

network. To guard against electrical shock, be sure to unplug your computer from its electrical outlet
before installing any cards.

7. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.

.

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1 alignment bar 2 fully seated card 3 not fully seated card
4 alignment guide 5 bracket within slot 6 bracket caught outside of slot

8. Before you close the card retention door, ensure that:

The tops of all cards and filler brackets are flush with the alignment bar.
The notch in the top of the card or filler bracket fits around the alignment guide.

1 alignment guide 2 alignment bar 3 release tab
4 card retention door

9. Close the card retention door by snapping it into place to secure the cards.

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NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer

cover from closing properly or cause damage to the equipment.

10. On a new card, connect any cables that are part of the installation. See the documentation for the card for information
about the card's cable connections. On a replacement card, connect any cables that you removed in step 5

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

.

11. Replace the computer cover (see Replacing the Computer Cover

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

12. Connect your computer and devices to electrical outlets and turn them on.

13. If you installed a sound card:

a. Enter system setup (see System Setup
b. Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the

microphone, speaker/headphone, or line-in connectors on the back panel.

14. If you installed an add-in network adapter and want to use only the add-in network adapter, then disable the
integrated network adapter:

a. Enter system setup (see System Setup
b. Connect the network cable to the add-in network adapter's connectors. Do not connect the network cable to the

integrated connector on the back panel.

NOTE: You can use the integrated NIC and add-in NIC adapter at the same time if you have a requirement. In

this case, set the Integrated NIC setting to On and install the driver for the add-in adapter.

15. Install any drivers required for the card as described in the card documentation.

), select Audio Controller, and then change the setting to Off.

), select Integrated NIC, and then change the setting to Off.

).

Removing a PCI Card

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. Gently push the release tab on the card retention door from the inside to pivot the door open. The door is hinged and
will remain in the open position.

4. If you are removing the card permanently, install a filler bracket in the empty card-slot opening.

NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the

computer. The brackets also keep dust and dirt out of your computer.

5. Close the card retention door by snapping it into place to secure the cards.

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

6. Replace the computer cover (see Replacing the Computer Cover

7. Reconnect the computer and devices to electrical outlets, and then turn them on.

).

).

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8. Remove any drivers required for the card as described in the card documentation.

9. If you removed a sound card:

10. If you removed an add-in network adapter:

a. Enter system setup (see System Setup
b. Connect external audio devices to the audio connectors on the back panel of the computer.

), select Audio Controller, and then change the setting to On.

a. Enter system setup (see System Setup
b. Connect the network cable to the integrated connector on the back panel of the computer.

), select Integrated NIC, and then change the setting to On.

PCI Express Cards

Your computer supports one PCI Express x16 card and one PCI Express x1 card.

If you are installing or replacing a PCI Express card, follow the procedures in the next section.
If you are removing, but not replacing a card, see Removing a PCI Express Card.
If you are installing or replacing a PCI card, see Installing a PCI Card.

CAUTION: When replacing the PCI Express Video Card, be aware that the heat sink on the card may be

very hot during normal operation. Be sure that the heat sink has had sufficiant time to cool before you
touch the card.

NOTE: If you are replacing a card, remove the current driver for the card from the operating system.

Installing a PCI Express Card

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

1 card retention door 2 card retention mechanism 3 release tabs (2)

).

3. Gently push the release tab on the card retention door from the inside to pivot the door open. The door is hinged and
will remain in the open position (see Installing a PCI Card

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4. If your computer includes a card retention mechanism to secure the x16 card in place from the top:

a. Pivot the mechanism upward and gently squeeze in on the sides to release the mechanism from the two tab slots

holding it in place.

b. Set the retention mechanism aside.

5. If you are installing a new card, remove the filler bracket to create a card-slot opening, then continue with step 7

6. If you are replacing a card that is already installed in the computer, remove the card.

Disconnect any cables connected to the card. Gently pull the securing tab, grasp the card by its top corners, and then
ease it out of its connector.

1 PCI Express x16 card 2 securing tab 3 PCI Express x1 card
4 PCI Express x1 card slot 5 PCI Express x16 card slot

7. Prepare the card for installation.

.

See the documentation that came with the card for information on configuring the card, making internal connections, or
otherwise customizing it for your computer.

CAUTION: Some network adapters automatically start the computer when they are connected to a

network. To guard against electrical shock, be sure to unplug your computer from its electrical outlet
before installing any cards.

8. If you are installing the card into the PCI Express x16 card connector, position the card so the securing slot is aligned
with the securing tab, and gently pull the securing tab.

9. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.

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1 alignment bar 2 fully seated card 3 not fully seated card
4 alignment guide 5 bracket within slot 6 bracket caught outside of slot

10. Ensure that:
The tops of all cards and filler brackets are flush with the alignment bar.
The notch in the top of the card or filler bracket fits around the alignment guide.

11. If previously removed, snap the card retention mechanism into place, securing the x16 PCI card.

1 card retention door 2 card retention mechanism 3 release tabs (2)

NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer

cover from closing properly or cause damage to the equipment.

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

12. Replace the computer cover (see Replacing the Computer Cover

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13. Reconnect the computer and devices to electrical outlets, and then turn them on.

12. If you removed an add-in network adapter:

14. If you installed a sound card:

15. If you installed an add-in network adapter, and want to only use it, then disable the integrated network adapter:

a. Enter system setup (see System Setup
b. Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the

microphone, speaker/headphone, or line-in connectors on the back panel.

), select Audio Controller, and then change the setting to Off.

a. Enter system setup (see System Setup
b. Connect the network cable to the add-in network adapter's connectors. Do not connect the network cable to the

integrated connector on the back panel.

NOTE: You can use the integrated NIC and add-in NIC adapter at the same time. In this case, set the

Integrated NIC setting to On and install the driver for the add-in adapter.

16. Install any drivers required for the card as described in the card documentation.

), select Integrated NIC, and then change the setting to Off.

Removing a PCI Express Card

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. Gently push the release tab on the card retention door from the inside to pivot the door open. The door is hinged and
will remain in the open position (see Installing a PCI Card for an illustration of the card retention door).

4. If your computer includes a card retention mechanism, to secure the x16 card in place from the top:

a. Pivot the mechanism upward and gently squeeze in on the sides to release the mechanism from the two tab slots

holding it in place.

).

b. Set the retention mechanism aside.

5. If you are removing the card permanently, install a filler bracket in the empty card-slot opening.

NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the

computer. The brackets also keep dust and dirt out of your computer.

6. Reseat the card retention mechanism in the tabs and pivot downward to snap it into place.

7. Close the card retention door to snap it into place, securing the cards.

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

8. Replace the computer cover (see Replacing the Computer Cover

9. Reconnect the computer and devices to electrical outlets, and then turn them on.

10. Remove any drivers required for the card as described in the card documentation.

11. If you removed a sound card:
a. Enter system setup (see System Setup
b. Connect external audio devices to the audio connectors on the back panel of the computer.

), select Audio Controller, and then change the setting to On.

).

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a. Enter system setup (see System Setup), select Integrated NIC, and then change the setting to On.
b. Connect the network cable to the integrated connector on the back panel of the computer.

Drive Panel

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

removing the cover.

Removing the Drive Panel

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

).

1 sliding plate lever 2 sliding plate 3 drive panel

3. Grasping the lever on the sliding plate, pull the sliding plate to the right until it snaps into the open position.

NOTE: This sliding plate secures and releases the drive panel and helps to secure the drives.

4. By pushing from the inside and pivoting the drive panel to the left, you can release the drive panel from its side
hinges.

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5. Set the drive panel aside.

Removing the Drive-Panel Insert

1 drive panel 2 drive-panel insert tab 3 drive-panel insert

1. Press the drive-panel insert tab towards the center of the drive-panel insert to disengage the insert from the drive
panel.

2. Without releasing the tab, pivot the drive-panel insert out and away from the drive panel.

3. Set the drive-panel insert aside.

Installing the Drive-Panel Insert

1 center drive-panel tab 2 drive panel 3 drive-panel insert tab
4 drive-panel insert

1. Slide the tab on the left side of the drive-panel insert under the center drive-panel tab.

2. Rotate the drive-panel insert into place and snap the drive-panel insert tab over the corresponding tab on the drive
panel.

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Installing the Drive Panel

1. Follow the procedures in Before You Begin.

1 sliding plate lever 2 sliding plate 3 drive panel

2. Align the drive panel tabs with the side door hinges.

3. Rotate the drive panel toward the computer until it snaps into place on the front panel.

Drives

The computer supports a combination of these devices:

Two serial ATA hard drives
Two serial ATA CD or DVD drives
An optional floppy drive or an optional Media Card Reader

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1 CD/DVD

drive

Connect serial ATA hard drives to connectors labeled "SATA0" or "SATA1" on the system board.
Connect serial ATA CD or DVD drives to connectors labeled "SATA4" or "SATA5" on the system board.

NOTE: Connectors SATA2 and SATA3 are not installed on the system board.

2 FlexBay for optional floppy drive or optional Media Card

Reader

3 hard

drive

Connecting Drive Cables

When you install a drive, you connect a DC power cable and a data cable to the back of the drive.

1 power cable 2 power input connector

Drive Interface Connectors

Most interface connectors are keyed for correct insertion; that is, a notch or a missing pin on one connector matches a tab or
a filled-in hole on the other connector. Keyed connectors ensure that the pin-1 wire in the cable goes to the pin-1 end of the
connector. The pin-1 end of a connector on a board or a card is usually indicated by a silk-screened "1" printed directly on

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the board or card.

1 interface cable 2 interface connector

Hard Drive

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

removing the cover.

NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a

foam pad, that will sufficiently cushion it.

NOTICE: If you are replacing a hard drive that contains data you want to keep, back up your files before you begin

this procedure.

Check the documentation for the drive to verify that it is configured for your computer.

Removing a Hard Drive

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. Disconnect the power and data cables from the drive.

NOTICE: Use the pull-tab to remove the data cable from your hard drive or from the system board.

).

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1 serial ATA data cable 2 power cable

4. Press in on the blue tabs on each side of the drive and slide the drive up and out of the computer.

1 tabs (2) 2 hard drive

5. If removing this drive changes the drive configuration, then be sure to reflect these changes in system setup. When
you restart your computer, enter system setup (see System Setup
under SATA 0 through 5, set the SATA ports to the correct configuration.

), then go to the "Drives" section of the BIOS and

Installing a Hard Drive

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. Check the documentation for the drive to verify that it is configured for your computer.

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).

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restart your computer, enter system setup (see System Setup ), then go to the "Drives" section of the BIOS and under

NOTE: If your replacement hard drive does not have the hard drive bracket attached, remove the bracket from the old

drive by unsnapping it from the drive. Snap the bracket onto the new drive.

1 drive 2 hard-drive bracket

4. Gently slide the drive into place until you feel a click or feel the drive securely installed.

5. Connect the power and hard-drive cables to the drive.

1 serial ATA data cable 2 power cable

6. Check all cables to be certain that they are properly connected and firmly seated.

7. Replace the computer cover (see Replacing the Computer Cover).

NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the

computer.

8. Connect your computer and devices to electrical outlets, and then turn them on.

9. If installing this drive changes the drive configuration, be sure to reflect these changes in system setup. When you

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SATA 0 through 5, set the SATA ports to the correct configuration.

See the documentation that came with the drive for instructions on installing any software required for drive operation.

Adding a Second Hard Drive

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

removing the cover.

NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a

foam pad, that will sufficiently cushion it.

1. Check the documentation for the drive to verify that it is configured for your computer.

2. Follow the procedures in Before You Begin

3. Remove the computer cover (see Removing the Computer Cover

4. Press in on the blue release tabs on each side of the hard drive bracket and slide it up and out of the computer.

5. Snap the bracket to the hard drive.

6. Gently slide the new drive (second hard drive) into place until you feel a click or feel the drive securely installed.

.

).

1 release tabs (2) 2 second hard drive in lower bay 3 hard drive bay
4 primary hard drive in upper bay

7. Connect the power and data cables to the drive.

8. Connect the other end of the data cable to SATA1 on the system board (see System Board Components).

9. Check all cables to be certain that they are properly connected and firmly seated.

10. Replace the computer cover (see Replacing the Computer Cover

NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the

computer.

11. Connect your computer and devices to electrical outlets, and then turn them on.

12. When you restart your computer, enter system setup (see System Setup

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).

), then go to the "Drives" section of the BIOS

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and under SATA 0 through 5, set the SATA port to "ON" for the hard drive you just installed to enable the drive.

See the documentation that came with the drive for instructions on installing any software required for drive operation.

Floppy Drive

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

removing the cover.

Removing a Floppy Drive

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. Remove the drive panel (see Removing the Drive Panel

).

).

1 power cable 2 data cable

4. Disconnect the power and data cable from the back of the floppy drive. Disconnect the other end of the cable from the
floppy connector on the system board (see System Board Components

5. Remove the data cable from the clip on the processor shroud. Remove the cable from the computer.

NOTE: If you have installed a PCI Express x16 card, this card may cover the floppy-drive connectors. If necessary,

remove this card before disconnecting the floppy drive cables (see Removing a PCI Express Card

6. Slide the drive latch release toward the bottom of the computer, and then slide the floppy drive out through the front
of the computer.

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).

).

Removing and Installing Parts: Dell Dimension E520 Service Manual

1 drive release latch 2 sliding plate 3 floppy drive

7. If you are not replacing the drive, reinstall the drive panel insert (see Installing the Drive-Panel Insert

8. If you are not replacing the drive, be sure to reflect these changes in system setup. When you restart your computer,
enter system setup (see System Setup), then go to the "Drives" section of the BIOS and under Diskette Drive set the
value to none.

).

Installing a Floppy Drive

NOTE: In the event that the replacement or new floppy drive does not have shoulder screws, use the shoulder screws

located within the drive panel insert. Otherwise, reuse the screws attached to the drive that you are replacing.

1. Follow the procedures in Before You Begin

2. Remove the computer cover (see Removing the Computer Cover

3. Remove the drive panel (see Removing the Drive Panel

4. If this is a new drive installation:

Remove the drive panel insert (see Removing the Drive-Panel Insert).
Remove the four shoulder screws from the insert.

.

).

).

Install two of the shoulder screws on each side of the drive.

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1 floppy drive 2 shoulder screws (4)

5. Gently slide the drive into place until you feel a click or feel the drive securely installed.

6. Attach the power and data cables to the floppy drive.

7. Connect the other end of the data cable to the connector labeled "FLOPPY" on the system board (see System Board

Components) and route the cable through the clip on the processor shroud.

1 power cable 2 data cable 3 processor shroud clip

8. Check all cable connections, and fold cables out of the way to avoid blocking airflow between the fan and cooling vents.
Insert the floppy data cable into the clip on top of the processor shroud.

9. Replace the drive panel (see Installing the Drive Panel

10. Replace the computer cover (see Replacing the Computer Cover

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

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11. Connect your computer and devices to their electrical outlets, and then turn them on.

See the documentation that came with the drive for instructions on installing any software required for drive operation.

12. Enter system setup (see System Setup) and select the appropriate Diskette Drive option.

Media Card Reader

Removing a Media Card Reader

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body

before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface
on the computer chassis.

1. Follow the procedures in Before You Begin

2. Remove the computer cover (see Removing the Computer Cover

3. Remove the drive panel (see Removing the Drive Panel

.

).

).

1 Media Card Reader (optional) 2 cable 3 USB connector

4. Disconnect the USB cable from the back of the Media Card Reader. Disconnect the other end of the cable from the USB
connector on the system board (see System Board Components
computer.

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). Remove the cable from any clips and lift out of the

Removing and Installing Parts: Dell Dimension E520 Service Manual

1 drive release latch 2 sliding plate 3 Media Card Reader

5. Pull the sliding plate to the right, then slide the drive out the front of the computer.

6. Replace the drive panel insert, as needed (see Installing the Drive-Panel Insert).

7. Replace the drive panel (see Installing the Drive Panel

8. Replace the computer cover (see Replacing the Computer Cover

9. Power up the system and enter system setup (see System Setup

).

).

). Set the USB for FlexBay value to OFF.

Installing a Media Card Reader

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in

the Product Information Guide.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body

before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface
on the computer chassis.

1. Follow the procedures in Before You Begin

2. Remove the computer cover (see Removing the Computer Cover

.

).

3. Remove the drive panel (see Removing the Drive Panel

4. Remove the drive panel insert (see Removing the Drive-Panel Insert
panel insert.

5. Remove the Media Card Reader from its packaging.

6. Remove the shoulder screws from the inside of the drive-panel insert and attach the screws to the new Media Card

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).

). Remove the four shoulder screws from the drive

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Reader.

1 Media Card Reader 2 screws (4)

7. Gently slide the Media Card Reader into place until you feel a click or feel the drive securely installed.

Ensure that the Media Card Reader is installed before the FlexBay cable is connected.

8. Connect the USB cable to the back of the Media Card Reader and to the USB connector on the system board (see

System Board Components

).

1 Media Card Reader 2 USB cable 3 USB connector

9. Route the USB cable through the cable routing clip.

10. Replace the computer cover (see Replacing the Computer Cover).

11. Power up the system and enter system setup (see System Setup

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). Set the USB for FlexBay value to ON.

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CD/DVD Drive

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in

the Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

removing the cover.

Removing a CD/DVD Drive

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. Remove the drive panel (see Removing the Drive Panel

4. Disconnect the power cable and the CD/DVD drive cable from the back of the drive and the system board.

.

).

).

1 power cable 2 data cable

5. Slide the drive release mechanism to the right to release the shoulder screw, and then slide the drive out to remove it
from the drive bay.

6. If you are not replacing the drive, replace the drive panel insert (see Installing the Drive-Panel Insert

7. Replace the drive panel (see Installing the Drive Panel

8. Replace the computer cover (see Replacing the Computer Cover

9. If you are removing and not replacing this drive, be sure to disable the drive in system setup. When you restart your
computer, enter system setup (see System Setup), then go to the "Drives" section of the BIOS and under SATA 0
through 5, set the SATA ports to the correct configuration.

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).

.

.

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1 drive release latch 2 sliding plate 3 CD/DVD drive

Installing a CD/DVD Drive

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. If you are installing a new drive, unpack the drive and prepare it for installation.

Check the documentation that accompanied the drive to verify that the drive is configured for your computer.

4. If you are installing a new drive, remove the drive panel insert (see Removing the Drive-Panel Insert
three shoulder screws from the inside of the drive-panel insert and attach the screws to the new drive.

5. Slide the drive into the drive bay until the drive clicks into position.

).

), then remove

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1 CD/DVD drive 2 screws (3)

6. Connect the power cable to the drive.

7. Connect the CD/DVD data cable to the drive and to the SATA4 connector on the system board (see System Board

Components).

NOTE: If you are installing a second CD/DVD drive connect the data cable to SATA5.

.

1 power cable 2 data cable

8. Check all cable connections, and fold cables out of the way to avoid blocking airflow between the fan and cooling vents.

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9. Replace the drive panel (see Installing the Drive Panel).

10. Replace the computer cover (see Replacing the Computer Cover).

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

11. Connect your computer and devices to their electrical outlets, and then turn them on.

12. When you restart your computer, enter system setup (see System Setup), then go to the "Drives" section of the BIOS
and under SATA 0 through 5, enable the SATA port for this drive.

See the documentation that came with the drive for instructions on installing any software required for drive operation.

Battery

Replacing the Battery

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body

before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface
on the computer chassis.

A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years.
If you have to repeatedly reset time and date information after turning on the computer, replace the battery.

CAUTION: A new battery can explode if it is incorrectly installed. Replace the battery only with the same

or equivalent type recommended by the manufacturer. Discard used batteries according to the
manufacturer's instructions.

To replace the battery:

1. Record all the screens in system setup (see System Setup

2. Follow the procedures in Before You Begin

3. Remove the computer cover (see Removing the Computer Cover

4. Locate the battery socket (see System Board Components

NOTICE: If you pry the battery out of its socket with a blunt object, be careful not to touch the system board with the

object. Ensure that the object is inserted between the battery and the socket before you attempt to pry out the
battery. Otherwise, you may damage the system board by prying off the socket or by breaking circuit traces on the
system board.

.

) so that you can restore the correct settings in step 9.

).

).

5. Remove the battery by carefully prying it out of its socket with your fingers or with a blunt, nonconducting object such
as a plastic screwdriver.

6. Insert the new battery into the socket with the side labeled "+" facing up, then snap the battery into place.

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1 battery release lever 2 battery (positive side)

7. Replace the computer cover (see Replacing the Computer Cover

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

8. Connect your computer and devices to electrical outlets, and then turn them on.

9. Enter system setup (see System Setup) and restore the settings you recorded in step 1.

10. Properly dispose of the old battery.

See the Product Information Guide for battery disposal information.

).

Power Supply

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

Removing the Power Supply

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. Disconnect the DC power cables from the system board and the drives.

NOTICE: Note the routing of the DC power cables underneath the tabs in the computer frame as you remove them

from the system board and drives. You must route these cables properly when you replace them to prevent them from
being pinched or crimped.

4. Remove any cables from the cable routing clip on the power supply.

5. Remove the four screws that attach the power supply to the back of the computer frame.

6. Press the release tab located on the floor of the computer frame.

7. Slide the power supply approximately 1 inch towards the front of the computer.

8. Lift the power supply out of the computer.

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operation. Be sure that they have had sufficient time to cool before you touch them.

1 release tab 2 power supply 3 screws (4)
4 AC power connector

Installing the Power Supply

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

1. Slide the power supply into place.

2. Replace the four screws that secure the power supply to the back of the computer frame.

3. Reconnect the DC power cables.

4. Run the cables underneath the clips, and press the clips to close them over the cables.

5. Replace the computer cover (see Replacing the Computer Cover

NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug the cable into

the computer.

6. Connect your computer and devices to electrical outlets, and then turn them on.

).

Processor

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: The heat sink assembly, power supply, and other components may be very hot during normal

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NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body

before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface
on the computer.

Removing the Processor

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Front View of the Computer

3. If your computer includes a card retention mechanism, to secure the x16 card in place from the top:

a. Pivot the mechanism upward and gently squeeze in on the sides to release the mechanism from the two tab slots

holding it in place.

b. Set the retention mechanism aside.

4. Unhook the floppy drive cable from the clip on the processor shroud and move it out of the way.

).

1 floppy cable clip 2 processor shroud 3 card retention mechanism
4 release tabs (2)

5. Using a long Phillips screwdriver, loosen the two captive screws, one on each side of the plastic heat sink assembly
shield.

6. Rotate the heat sink assembly toward the rear of the computer, and then lift it from the computer.

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1 heat sink and fan shroud assembly 2 captive screw housing (2)

NOTICE: If you are installing a processor upgrade kit from Dell, discard the original heat sink. If you are not installing

a processor upgrade kit from Dell, reuse the original heat sink when you install your new processor.

7. At the processor, place your finger upon the hook end of the release lever, then push down and out to release it from
the tab that secures it.

1 processor cover 2 processor 3 processor socket
4 release lever

8. Release the release lever and lift the processor cover.

9. Gently remove the processor from the socket.

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Leave the release lever extended in the release position so that the socket is ready for the new processor.

Installing the Processor

NOTICE: Ground yourself by touching an unpainted metal surface on the back of the computer.

NOTICE: When replacing the processor, do not touch any of the pins inside the socket or allow any objects to fall on

the pins in the socket.

1. Unpack the new processor, being careful not to touch the underside of the processor.

NOTICE: You must position the processor correctly in the socket to avoid permanent damage to the processor and the

computer when you turn on the computer.

2. If the release lever on the socket is not fully extended, move it to that position.

3. Orient the front and rear alignment notches on the processor with the front and rear alignment notches on the socket.

4. Align the pin-1 corners of the processor and socket.

1 processor cover 2 securing tab 3 processor
4 processor socket 5 center cover latch 6 release lever
7 front alignment notch 8 socket and processor pin-1 indicator 9 rear alignment notch

NOTICE: To avoid damage, ensure that the processor aligns properly with the socket, and do not use excessive force

when you install the processor.

5. Set the processor lightly in the socket and ensure that the processor is positioned correctly.

6. When the processor is fully seated in the socket, close the processor cover.

Ensure that the securing tab on the processor cover is positioned underneath the center cover latch on the socket.

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7. Pivot the socket release lever back toward the socket and snap it into place beneath the securing tab.

NOTICE: If you are not installing a processor upgrade kit from Dell, reuse the original heat sink assembly when you

replace the processor.

If you installed a processor replacement kit from Dell, return the original heat sink assembly and processor to Dell in
the same package in which your replacement kit was sent.

8. Install the heat sink assembly:

a. Place the heat sink assembly back onto the heat sink assembly bracket.
b. Rotate the heat sink assembly down towards the computer base and tighten the two captive screws.

9. Place the floppy ribbon cable back across the top of the processor shroud, inserting the cable under the clip. Ensure
that the cable does not block airflow from the fan and cooling vents.

1 heat sink and fan shroud

assembly

10. Replace the computer cover (see Replacing the Computer Cover

NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug the cable into

the computer.

11. Connect your computer and devices to electrical outlets, and then turn them on.

2 heat sink assembly

bracket

3 captive screw housing

(2)

).

I/O Panel

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

opening the cover.

CAUTION: The heat sink assembly, power supply, and other components may be very hot during normal

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operation. Be sure that they have had sufficient time to cool before you touch them.

I/O-Panel Components

1 USB port 2 diagnostic, hard drive activity, and network

lights

4 microphone

connector

5 integrated audio connector with jumper

block

3 headphone

connector

Removing the I/O Panel

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Front View of the Computer

3. Remove the mounting screw from the top of the I/O panel.

4. Remove the I/O panel from the computer by sliding it towards the back of the computer. Slide it back far enough to
access the control panel cable.

5. Disconnect the control panel cable from the I/O panel connector.

).

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1 mounting screw 2 I/O panel

Installing the I/O Panel

Follow the removal procedure (Removing the I/O Panel) in reverse order.

If the old I/O panel has a jumper block, move it to the new I/O panel, unless the new one comes with a jumper block.
If the old I/O panel has no jumper block, then remove it from the new I/O panel if it comes with one.

When you slide the I/O panel back into the front panel, ensure all the I/O panel connectors fit into their spaces on the front
panel.

Processor Fan

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

opening the cover.

CAUTION: The heat sink assembly, power supply, and other components may be very hot during normal

operation. Be sure that they have had sufficient time to cool before you touch them.

Removing the Processor Fan

1. Follow the procedures in Before You Begin.

2. Remove the computer cover (see Removing the Computer Cover

3. If your computer includes a card retention mechanism to secure the x16 card in place:

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a. Pivot the mechanism upward and gently squeeze in on the sides to release the mechanism from the two tab slots

holding it in place.

b. Set the retention mechanism aside.

4. Unhook the floppy drive cable from the clips on the processor shroud and move it out of the way.

1 release tab 2 card retention mechanism 3 card retention door

5. Use a long Phillips screwdriver to loosen the two captive screws, one on each side of the heat sink assembly.

6. Rotate the heat sink assembly towards the rear of the computer, and then remove it from the computer.

1 heat sink and fan shroud assembly 2 captive screw housing (2)

7. Place the heat sink assembly on its side in a safe place.

8. Disconnect the system fan cable from the system board (see System Board Components).

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9. Ensure that all cables have been removed from the routing clips on the top of the system fan assembly.

1 fan release lever 2 fan release lever tab 3 processor fan

10. The fan has two release levers. One on the side facing the hard disk and a smaller one on the opposite side next to the
bottom cover. Release both fan levers, then slide the fan toward the back of the computer to release the four fan tabs
from the four slots in the bottom cover.

11. Remove the fan from the computer.

Installing the Processor Fan

When reinstalling the fan, ensure that you do not pinch the wires that run between the system board and the fan.

NOTICE: Ensure that the four fan tabs are fully inserted into the four keyhole slots in the bottom cover so that the fan

can slide back fully into position. Ensure that the fan release lever tabs are seated into their respective slots.

Follow the fan removal procedure (Removing the Processor Fan

) in reverse order.

System Board

Removing the System Board

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before

opening the cover.

CAUTION: The heat sink assembly, power supply, and other components may be very hot during normal

operation. Be sure that they have had sufficient time to cool before you touch them.

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NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface,

such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to
dissipate any static electricity that could harm internal components.

1. Follow the procedures in Before You Begin

.

2. Remove the computer cover (see Removing the Computer Cover

3. Remove any components that restrict access to the system board, such as CD/DVD drives, floppy drive, hard drive, and
I/O panel.

4. Remove the heat sink assembly and processor (see Removing the Processor

5. Disconnect all cables from the system board.

6. Remove any memory modules that you are transferring to the new system board (see Removing Memory

).

). Store them in a safe static free place.

).

1 system board 2 screws (8)

7. Remove 8 screws that secure the system board. Six of the screws go through the system board and two of the screws
go through the heat sink pivot mounted on the system board.

8. Slide the system board assembly toward the front of the computer, and then lift the board out of the computer.

9. Place the system board assembly that you just removed next to the replacement system board to verify that it is
identical.

Installing the System Board

1. Gently align the board into the chassis and slide it toward the back of the computer.

2. Replace the 8 screws on the system board.

3. Install the processor and heat sink (see Installing the Processor

4. Install the memory modules that were removed from the old system board (see Installing Memory

5. Replace any remaining components components that you removed from the system board.

).

).

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6. Reconnect all cables to their connectors at the back of the computer.

7. Replace the computer cover (see Replacing the Computer Cover).

NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug the cable into

the computer.

8. Connect your computer and devices to electrical outlets, and then turn them on.

NOTE: If the new system board requires flashing the BIOS, refer to Flashing the BIOS.

Replacing the Computer Cover

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the

Product Information Guide.

1. Ensure that all cables are connected. Fold the cables so they are out of the way.

2. Ensure that no tools or extra parts are left inside the computer.

3. Align the bottom of the cover with the tabs located along the bottom edge of the computer.

4. Using the tabs as leverage, rotate the cover downward, and then press down to close it.

1 computer cover 2 back of computer 3 bottom hinges

5. Ensure that the cover is seated correctly before moving the computer to the upright position.

NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

6. Connect your computer and devices to electrical outlets, and then turn them on.

Back to Contents Page

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