Dell XPS 400 User Manual

Dell XPS 400 Service Manual

Dell™ XPS™ 400 Service Manual

About Your Computer
Before You Begin
Removing the Computer Cover
Technical Overview
Specifications

Advanced Troubleshooting
System Setup
Removing and Installing Parts
Replacing the Computer Cover

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, XPS, and the DELL logo 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
August 2006 Rev. A01

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About Your Computer: Dell XPS 400 Service Manual

Back to Contents Page

About Your Computer

Dell™ XPS™ 400 Service Manual

Front View of the Computer
Back View of the Computer

Front View of the Computer

1 cover latch

release

2 CD or DVD

activity
light

3 CD or DVD

eject
button

4 Floppy

drive bay
5 FlexBay Can contain an optional floppy drive or optional Media Card Reader.
6 IEEE 1394 Use the optional IEEE 1394 connector for high-speed data devices such as

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Use this latch to remove the cover. See "Removing the Computer Cover."

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

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

Can contain an optional floppy drive.

About Your Computer: Dell XPS 400 Service Manual

connector

digital video cameras and external storage devices.

(optional)
7 vents For adequate cooling, do not block any of the vents.

NOTICE: Do not use the vents as handles; doing so may result in damage to

your computer. Also, ensure that there is a minimum of two inches of space
between all vents and any object near these vents.

8 USB 2.0

connectors

(2)

9 power

button

10 hard-drive

activity

light
11 diagnostic

lights (4)
12 headphone

connector
13 microphone

connector
14 Service

Tag

Use the front USB connectors for devices that you connect occasionally, such
as joysticks or cameras. It is recommended that you use the back USB
connectors for devices that typically remain connected, such as printers,
keyboards, and mice, or for bootable USB devices, which may not function
properly if attached to the front connectors.

Press 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 activity light is on when the computer reads data from or

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

Use the lights to help you troubleshoot a computer problem based on the
diagnostic code. For more information, see "Diagnostic Lights

Use the headphone connector to attach headphones.

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

Used to identify your computer when you access the Dell Support website or
call technical support.

."

Back View of the Computer

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About Your Computer: Dell XPS 400 Service Manual

1 power

connector

2 sound

card
connectors
(5)

3 network

connector

4 USB 2.0

connectors
(5)

Insert the power cable.

Line-in connector — Use the blue line-in connector to attach a
record/playback device such as a cassette player, CD player, or VCR.
Line-out connector — Use the green line-out connector to attach
headphones and most speakers with integrated amplifiers.
Microphone connector — Use the pink microphone connector to attach a
personal computer microphone for voice or musical input into a sound or
telephony program.
Surround connector — Use the black surround connector to attach
multichannel-capable speakers.
Center/subwoofer (Center/LFE) connector — Use the yellow subwoofer
connector to attach multiple speakers.

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

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

On computers with a network connector card, use the connector on the card.
Use the back USB connectors for devices that typically remain connected, such

as printers, keyboards, and mice, or for bootable USB devices which may not
function properly if attached to the front connectors (see "System Setup
more information on booting to a USB device)

" for

It is recommended that you use the front USB connectors for devices that you
connect occasionally, such as joysticks or cameras.

5 card slots

(6)

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Access connectors for any installed PCI or PCI Express cards.

About Your Computer: Dell XPS 400 Service Manual

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Before You Begin: Dell XPS 400 Service Manual

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Before You Begin

Dell™ XPS™ 400 Service Manual

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

Getting Started

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 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
Long Phillips screwdriver
Flash BIOS update program floppy disk or CD

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 Turn Off

Computer.

b. In the Turn off computer window, click Turn off.

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.

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Before You Begin: Dell XPS 400 Service Manual

Before Working Inside Your Computer

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.

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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Removing the Computer Cover: Dell XPS 400 Service Manual

Back to Contents Page

Removing the Computer Cover

Dell™ XPS™ 400 Service Manual

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: 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. If you have installed a security cable, remove it from the security cable slot.

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.

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

4. Pull back the cover latch release on the top panel.

."

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

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Removing the Computer Cover: Dell XPS 400 Service Manual

6. Grip the sides of the computer cover and pivot the cover up.

7. Lift the cover away and set it aside in a secure location.

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Technical Overview: Dell XPS 400 Service Manual

Back to Contents Page

Technical Overview

Dell™ XPS™ 400 Service Manual

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

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.

System Board Components

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Technical Overview: Dell XPS 400 Service Manual

Power Supply DC Connector Pin Assignments

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Technical Overview: Dell XPS 400 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 XPS 400 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 and P5

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 XPS 400 Service Manual

4 COM Black
5 +12 VB DC White

DC Power Connector P4

Pin Number Signal Name 18-AWG Wire

1 N/C N/C
2 COM Black
3 COM Black
4 +3.3 VDC Orange
5 +5 VDC Red
6 +12A VDC Yellow

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 Connectors P8, P9, and P10

Pin Number Signal Name 18-AWG Wire

1 +12 VA DC Yellow

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Technical Overview: Dell XPS 400 Service Manual

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.

DC Power Connector P11

Pin Number Signal Name 18-AWG Wire

1 +12 VB DC White
2 COM Black
3 COM Black
4 +5V DC Red

DC Power Connector P12

Pin Number Signal Name 18-AWG Wire

1 +12 B VDC White
2 +12 B VDC White
3 +12 B VDC White
4 COM Black
5 COM Black
6 COM Black

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Specifications: Dell Dimension 9150 Service Manual

Back to Contents Page

Specifications

Dell™ XPS™ 400 Service Manual

Processor

Processor type Intel® Pentium® 4 Socket-T with Hyper-

Threading or Dual-Core support

Cache 2 MB

Memory

Type dual-channel 533- and 667-MHz DDR2
Memory connectors four
Memory capacities 256 MB, 512 MB, or 1 GB
Minimum memory 512 MB
Maximum memory 4 GB
BIOS address F0000h

Computer Information

Chipset Intel 945P
DMA channels eight
Interrupt levels 24
BIOS chip (NVRAM) 4 Mb
NIC integrated-network interface capable of

10/100/1000-Mbps communication

System clock 800- or 1066-MHz data rate

Video

Type PCI Express

Audio

Type internal 7.1 channel or PCI option cards

Expansion Bus

Bus type PCI 32 bit

PCI Express x1, x4, and x16

Bus speed PCI 33 MHz

PCI Express 100 MHz

Bus throughput PCI Express:

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x1 slot bidirectional speed — 500
MB/s

Specifications: Dell Dimension 9150 Service Manual

center/Low Frequency Effects (LFE)

PCI

connectors three
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 x4
connector size 98 pins
connector data width (maximum) 4 PCI Express lanes

x4 slot bidirectional speed — 2
GB/s

x16 slot bidirectional speed — 8
GB/s

PCI Express

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

Drives

Externally accessible:

two 3.5-inch drive bays (FlexBay)

two 5.25-inch drive bays

Available devices serial ATA drives (2), floppy drive, USB

memory devices, CD drive, CD-RW drive,
DVD drive, DVD-RW drive, Media Card
Reader, and DVD/CD-RW combo drive

Internally accessible: two 3.5-inch hard-drive bays

Connectors

External connectors:

IEEE 1394 one front-panel 6-pin serial connector

(with optional card)

Video 15-pin VGA connector

28-pin DVI connector
Network adapter RJ-45 connector
USB two front-panel and five back-panel USB

2.0-compliant connectors

Audio five back-panel connectors for line-in,

line-out, microphone, surround, and

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Specifications: Dell Dimension 9150 Service Manual

channel; two front-panel connectors for

headphones/microphone

System board connectors:

Primary IDE drive 40-pin connector
Serial ATA four 7-pin connectors
FlexBay Drive USB 10-pin header for optional floppy

Fan two 3-pin and one 5-pin connector
PCI three 120-pin connectors
PCI Express x1 36-pin connector
PCI Express x4 98-pin connector
PCI Express x16 164-pin connector

Controls and Lights

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

drive or optional Media Card Reader (3.5-

inch bay devices)

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, this indicates

a problem with the system board (see

"Power Lights

").
Hard-drive access light green
Link integrity light (on integrated network

adapter)

Activity light (on integrated network
adapter)

Diagnostic lights four lights on the front panel (see

Standby power light AUXPWR on the system board

Power

DC power supply:

Wattage 375 W
Heat dissipation 1280 BTU/hr

green light — A good connection exists
between a 10-Mbps network and the
computer.

orange light — A good connection exists
between a 100-Mbps network and the
computer.

off (no light) — The computer is not
detecting a physical connection to the
network.

yellow light — Blinking indicates activity
on the network.

"Diagnostic Lights

")

NOTE: Heat dissapation is calculated
based upon the power supply wattage
rating.

Voltage (See the safety instructions manual selection power supplies — 90 to

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Specifications: Dell Dimension 9150 Service Manual

in the Product Information Guide

135 V and 180 to 265 V at 50/60 Hz

for important voltage setting
information.)

Backup battery 3-V CR2032 lithium coin cell

Physical

Height 46.48 cm (18.3 inches)
Width 18.54 cm (7.3 inches)
Depth 45.42 cm (17.88 inches)
Weight 15.4 kg (34 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 0.25 G at 3 to 200 Hz at 0.5 octave/min

Storage 0.5 G at 3 to 200 Hz at 1 octave/min
Maximum shock:

Operating bottom half-sine pulse with a change in

Storage 27-G faired square wave with a velocity

Altitude:

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

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

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velocity of 20 inches/sec (50.8 cm/sec)

change of 200 inches/sec (508 cm/sec)

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Advanced Troubleshooting: Dell XPS 400 Service Manual

Back to Contents Page

Advanced Troubleshooting

Dell™ XPS™ 400 Service Manual

Power Lights
Diagnostic Lights
Beep Codes

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 into both 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.

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.
Remove and then reinstall any cards.
Remove and then reinstall the graphics card, if applicable.
Ensure that all power cables are securely connected to the system board.

Diagnostic Lights

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

Product Information Guide.

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Advanced Troubleshooting: Dell XPS 400 Service Manual

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. After the computer starts, all four lights
display solid green. If the computer malfunctions, the color and sequence of the lights 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.

The diagnostic lights
are not lit 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.

A possible graphics
card failure has
occurred.

Plug the computer into a working electrical outlet. Also see "Power Lights

Reinstall the processor and restart the computer.

If you have two or more memory modules installed, remove the modules,
reinstall one module (see "Memory
the computer starts normally, reinstall an additional module. Continue
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 "Memory
If the problem persists, contact Dell.

If the computer has a graphics card, remove the card (see "Cards"),
reinstall it, and then restart the computer.
If the problem still exists, install a graphics card that you know works
and restart the computer.
If the problem persists, contact Dell.

").

"), and then restart the computer. If

."

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 compatibility error
exists.

A possible expansion
card failure has
occurred.

Reseat all power and data cables and restart the computer.

Reinstall all USB devices, check cable connections, and then restart the
computer.

If you have two or more memory modules installed, remove the modules,
reinstall one module (see "Memory
the computer starts normally, reinstall an additional module. Continue
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 "Memory
If the problem persists, contact Dell.

Ensure that no special memory module/memory connector placement
requirements exist (see "Memory
Verify that the memory modules that you are installing are compatible
with your computer (see "Memory
If the problem persists, contact Dell.

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

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

3. Repeat this process for each card. If the computer starts normally,
troubleshoot the last card removed from the computer for resource
conflicts (see "Cards

4. If the problem persists, contact Dell.

").

").

"), and then restart the computer. If

").

").

").

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Advanced Troubleshooting: Dell XPS 400 Service Manual

Another failure has
occurred.

The computer is in a
normal operating
condition after POST.

Ensure that the cables are properly connected to the system board from
the hard drive, CD drive, and DVD drive (see "System Board

Components").

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.
The operating system is attempting to boot from a device (such as the
floppy drive or hard drive); check system setup
sequence is correct for the devices installed on your computer.
If the problem persists, contact Dell.

None.

to make sure the boot

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. One possible beep code (code 1-3-1) 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 may fix the beep code errors in the following table. If the problem persists, 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 hear one of the following beep codes, 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
1-2-2 DMA initialization failure
1-2-3 DMA page register read/write failure
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

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Advanced Troubleshooting: Dell XPS 400 Service Manual

3-4-2 Screen retrace failure

Controller

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

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
State Low

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

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
information in the system
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 Ensure that the floppy drive or the hard drive is

If you receive this message after you make
changes in the system setup program, enter

the system setup program and restore the

original value(s).
Reseat the memory modules

Ensure that the drive is installed correctly in
the computer and defined correctly in the

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.

Enter the system setup

system configuration, and then restart the
computer.

Ensure that the drive is installed correctly in
the computer and defined correctly in the

system setup

cable at both ends.
The keyboard or system board

replaced.

.

program.

program, verify the

program. Check the interface

may need to be

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Advanced Troubleshooting: Dell XPS 400 Service Manual

communicate with the floppy

installed correctly in the computer and defined

Failure
HDD

Controller
Failure

INTR1 Error
INTR2 Error

Invalid Boot
Diskette

Keyboard
Error

KB/Interface
Error

No ROM
Basic

Back to Contents Page

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.

correctly in the system setup program. Check
the interface cable at both ends.

The keyboard or system board may need to be
replaced.

Enter the system setup

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

that drive A or drive C is properly identified.

program and confirm

program and confirm

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System Setup: Dell XPS 400 Service Manual

Back to Contents Page

System Setup

Dell™ XPS™ 400 Service Manual

Clearing Forgotten Passwords
Clearing CMOS Settings

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: Unless you are an expert computer user, do not change the settings for this program. Certain changes can

make your computer work incorrectly.

Entering System Setup

1. Turn on (or restart) your computer.

2. When the blue DELL™ logo is displayed, you must watch for the F2 prompt to appear.

3. Once this F2 prompt appears, press <F2> immediately.

NOTE: The F2 prompt indicates that the keyboard has initialized. This prompt can appear very quickly, so you must

watch for it to display, and then press <F2>. If you press <F2> before you are prompted, this keystroke will be lost.

4. 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.

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.

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

Use the right and left arrow keys to
highlight an option. Press <Enter> to
make that selection active.

System Setup: Dell XPS 400 Service Manual

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 left and right
arrow keys, you can toggle between a primary topic (collapsed) and subtopics
(expanded).

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

Displays the System name, BIOS Version number, Service Tag, Express Service Code, and Asset
Tag.

System Info

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.

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

Displays the following information for the processor installed in the system: Processor Type, Processor

Processor Info

Memory Info

PCI Info Displays the contents of each PCI slot.
Date/Time Controls the system's internal calendar and clock.

Boot Sequence

Drives

Diskette
Drive

SATA Drives 0
through 3

Clock Speed, Processor Bus Speed, Processor Cache Size, Processor ID number, whether the
processor is Hyperthreading or Multiple Core Capable, and if the processor has 64-bit Technology.

Displays the amount of Installed Memory, Memory Speed, Memory Channel Mode, and a
description of the Memory Technology. This option also displays a table that describes the memory
size, whether the memory module is ECC capable, single or dual rank, type, and organization.

Determines the order in which the system searches for boot devices during system startup.

NOTE: If you insert a boot device and restart the computer, this option appears in the system setup

menu. To boot from a USB memory device, select the USB device and move it so it becomes the first
device in the list.

Enables and disables the floppy drives and sets read permission for the internal floppy drive. Off disables
all floppy drives. USB enables the USB floppy drive. Internal (the default setting) enables the internal
floppy drive. Read Only enables the internal drive controller and allows the internal floppy drive read­only permission.

NOTE: Operating systems with USB support will recognize USB floppy drives regardless of this setting.

Enables or disables a SATA device (such as a hard-drive). On (the default setting) enables the interface
so that the device can be used.

Displays the Controller type (SATA), Port number the drive is using, Drive ID number, Capacity, Link
Speed, and whether the drive is controlled by the BIOS.

PATA Drives 0
through 1

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Enables or disables an ATA device (such as a CD or DVD drive). On (the default setting) enables the
interface so that the device can be used.

Displays the Controller type (ATA), Port number the drive is using, Drive ID number, Capacity, Link
Speed, and whether the drive is controlled by the BIOS.

System Setup: Dell XPS 400 Service Manual

Determines the integrated SATA controller's operating mode:

SATA Operation

Onboard Devices

Integrated
NIC
Controller

Integrated
Audio
Controller

USB
Controller

USB for
FlexBay

Video

RAID Autodetect/ AHCI (the default setting) – RAID if the drives are signed, otherwise AHCI
RAID Autodetect/ ATA – RAID if the drives are signed, otherwise ATA
RAID On – SATA is configured for RAID on every boot.

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 = Internal USB for FlexBay is enabled but not bootable.
The factory default setting is No Boot.

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

This setting specifies which video controller is primary, PCI or PEG.

Primary Video

Performance

Multiple CPU
Core

SpeedStep

HyperThreading

HDD Acoustic
Mode

Security

Admin
Password

NOTE: This only applies to a PCI video controller installed in the 32-bit, 33 MHz, PCI expansion slot.

Settings are reversed if a PCI video controller is installed in a 64-bit PCIx expansion slot.

This setting specifies whether more than one core is enabled. The performance of some applications may
improve with an additional core enabled. The default is On (second core enabled).

If applicable, Intel SpeedStep® appears in the Options List under Performance.
If your computer processor supports Hyper-Threading, this option appears in the Options List (defaults to

On).

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.

This section displays available system security options.
Displays the current status of the system setup password security feature and allows a new system setup

password to be assigned and verified.

System
Password

Password
Changes

Execute
Disable

Power Management

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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. Also, a valid
Admin password is required to change the system password (defaults to Unlocked).

Enables or disables Execute Disable memory protection technology. On is the default setting.

System Setup: Dell XPS 400 Service Manual

Determines what happens when AC power is restored to the computer. On restarts the computer when

AC Recovery

Auto Power On

Auto Power
Time

Suspend Mode

Maintenance

SERR DMI
Message

Asset Tag
Owner Tag

Load Defaults

power is restored after an outage. Last returns the computer to its last state before power was removed.
Off is the default setting.

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.
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, however, system memory
remains active.

Some graphics cards require that the SERR DMI message be disabled. The default setting is On.
Displays the system asset tag.

Displays the system owner tag.
When Continue is selected, this setting restores the computer's default settings. The default setting is

Cancel.

Event Log

POST Behavior

Fastboot

Numlock Key

POST Hotkeys
Keyboard

Errors

Displays the system event log.

When set to On (default), your computer starts more quickly because it skips 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 enables or disables keyboard error reporting when the computer starts.

Boot Sequence

This feature allows you to change the boot sequence for devices.

Option Settings

Diskette Drive — The computer attempts to boot from the floppy drive. If the floppy in the drive is not bootable, the

computer attempts to boot to the hard drive.
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 to the next bootable device.
CD 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 to the next bootable device.

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

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

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System Setup: Dell XPS 400 Service Manual

USB Flash 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 flash
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, or CD­RW drive.

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

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

2. Turn on (or restart) your computer.

3. When F2 = Setup, F12 = Boot Menu appears in the upper-right corner of the screen, press <F12>.

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.

The Boot Device Menu appears, listing all available boot devices. Each device has a number next to it.

4. At the bottom of the menu, enter the number of the device that is to be used for the current boot only.

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.

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

").

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 checkmark).

5. Press plus (+) or minus (–) to move a selected device up or down the list.

Clearing Forgotten Passwords

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

Product Information Guide.

1. Follow the procedures in "Before You Begin

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System Setup: Dell XPS 400 Service Manual

2. Locate the 3-pin password jumper (PSWD) on the system board, and remove the jumper plug from pins 1 and 2.

3. Place the jumper plug on pins 2 and 3.

4. Replace the computer cover

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

6. After the Microsoft® Windows® desktop appears on your computer, shut down the computer.

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

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

9. Open the computer cover

10. Reattach the password jumper (PSWD) to pins 1 and 2 to re-enable the password feature.

11. Replace 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.

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

.

.

.

Clearing CMOS Settings

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

Product Information Guide.

1. Follow the procedures in "Before You Begin

2. Reset the current CMOS settings:

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System Setup: Dell XPS 400 Service Manual

a. Locate the 3-pin CMOS jumper (RTCRST) on the system board (see "Clearing Forgotten Passwords").

b. Remove the jumper plug from pins 1 and 2.

c. Place the jumper plug on pins 2 and 3 and wait approximately five seconds.

d. Replace the jumper plug on pins 1 and 2.

3. Replace 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.

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

Back to Contents Page

.

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Removing and Installing Parts: Dell XPS 400 Service Manual

Back to Contents Page

Removing and Installing Parts

Dell™ XPS™ 400 Service Manual

Memory
Cards
Drive Panels
Drives
Hard Drive
Floppy Drive
Media Card Reader

CD/DVD Drive
Power Supply
Processor
I/O Panel
Battery
System Board

Memory

You can increase your computer memory by installing memory modules on the system board. For information on the type of
memory supported by your computer, see "Specifications

NOTICE: Before you install new memory modules, download the most recent BIOS for your computer from the Dell™

Support website at support.dell.com.

Memory Overview

."

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

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

The recommended memory configurations are:

A pair of matched memory modules installed in connectors DIMM_1 and DIMM_2

or

A pair of matched memory modules installed in connectors DIMM_1 and DIMM_2 and another matched pair
installed in connectors DIMM_3 and DIMM_4

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

If you install mixed pairs of DDR2 400-MHz (PC2-3200), DDR2 533-MHz (PC2-4300) and DDR2 667-MHz (PC2-5300)

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memory, the modules function at the slowest speed installed.

Be sure to install a single memory module in the DIMM_1 connector, the connector closest to the processor, before you
install modules in the other connectors.

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

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 connectors DIMM_1 and DIMM_2 or connectors
DIMM_3 and DIMM_4.

Addressing Memory With 4-GB Configurations

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

1. Follow the procedures in "Before You Begin

2. Remove the computer cover

3. Lay the computer on its side so that the system board is on the bottom of the inside of the computer.

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

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.

."

Removing and Installing Parts: Dell XPS 400 Service Manual

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

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.

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

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

7. Replace 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 turn them on.

9. When the message appears stating that memory size has changed, press <F1> to continue.

10. Log on to your computer.

11. Right-click the My Computer icon on your Windows desktop and click Properties.

12. Click the General tab.

13. 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.

1. Follow the procedures in "Before You Begin

2. Remove the computer cover

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.

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

Three 33-MHz PCI card slots
One PCI Express x1 card slot
One PCI Express x16 card slot
One PCI Express x4 card slot

Removing and Installing PCI and PCI Express Cards

NOTE: Dell offers an optional customer kit for Audigy II and IEEE 1394 PCI add-in-cards that includes a front-mounted

IEEE 1394 connector.

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

2. Follow the procedures in "Before You Begin

3. Remove the computer cover

.

."

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4. Push the two release tabs on the card retention door from the inside to pivot the door open. Because the door is
captive, it will remain in the open position.

5. If your computer includes a card retention mechanism:

a. Grasp the end of the card retention mechanism and, while pressing the release tab down with your thumb,

rotate the mechanism towards the base of the computer.

b. Detach the mechanism from its retaining tabs and set it aside in a secure location.

6. If a "piano" bracket (for full-length PCI-E cards) is present on your computer, rotate it upward by pressing the tabs on
the side of the bracket toward each other.

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7. If you are replacing or removing a card:

a. If necessary, disconnect any cables connected to the card.
b. Pull the securing tab (if present), grasp the card by its top corners, and ease it out of its connector.

c. If you are not replacing the card, 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.

8. If you are installing a new card, remove the filler bracket to create a card-slot opening

9. 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.

10. Position the card so that it is aligned with the slot and (if present) the securing tab is aligned with the securing slot.

NOTICE: Ensure that you release the securing tab to seat the card. If the card is not installed correctly, you may

damage the system board.

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

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12. 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.

13. Close the card retention door by snapping it into place to secure the card(s).

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.

14. If you installed a card, connect any cables that should be attached to the card.

See the documentation for the card for information about the card cable connections.

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15. If a card retention mechanism is present on your computer, reseat it in its tabs, and rotate it down until it snaps into

place.

16. If a "piano" bracket (for full-length PCI-E cards) is present on your computer, rotate it down into place.

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

the computer.

17. Replace the computer cover

18. If you removed or installed a sound card or a network adapter, see "Network Adapter and Sound Card Settings

19. Add or remove drivers:

a. If you removed a card, remove the current driver for the card from the operating system.
b. If you installed a card, install any drivers required for the card as described in the card documentation.

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

."

Network Adapter and Sound Card Settings

If you installed a sound card:

1. Enter system setup

2. Connect external audio devices to the sound card connectors. Do not connect external audio devices to the microphone,
speaker/headphone, or line-in connectors on the back panel.

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

If you removed a sound card:

1. Enter system setup, select Integrated Audio Controller, and then change the setting to On.

2. Connect external audio devices to the audio connectors on the back panel of the computer.

If you installed an add-in network adapter and want to disable the integrated network adapter:

1. Enter system setup

2. Connect the network cable to the add-in network adapter connectors. Do not connect the network cable to the
integrated connector on the back panel.

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

Removing and Installing Parts: Dell XPS 400 Service Manual

If you removed an add-in network connector:

1. Enter system setup

2. Connect the network cable to the integrated connector on the back panel of the computer.

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

Drive Panels

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. Grasping the lever on the sliding plate, pull the sliding plate to the right and hold in place.

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

3. Push from the inside and pivot the drive panel to the left to release the panel from its side hinges.

4. Set the drive panel aside in a secure location.

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Removing the Drive-Panel Insert

NOTICE: Drive-panel inserts may contain screws on the inside. You can attach the screws to new drives that do not

have any screws.

NOTICE: To avoid breaking the drive-panel insert tab, do not pull the insert more than approximately 1 cm (½ inch)

away from the drive panel before sliding the tab out of the slot.

1. On the inside of the drive panel, pinch the two drive-panel insert release tabs together and pull the insert out and to
the right just enough to release it from the drive panel.

2. Set the drive-panel insert aside in a secure location.

Replacing the Drive-Panel Insert

1. Place the drive-panel insert tab into the drive-panel slot.

2. Pinch the drive-panel insert release tabs and press the drive panel insert into place.

3. Ensure that the drive-panel insert is correctly seated in the drive panel.

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Replacing the Drive Panel

1. Follow the procedures in "Before You Begin."

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

3. Rotate the drive panel toward the computer until the sliding plate lever clicks into place and the drive panel snaps into
place on the front panel.

Drives

Your computer supports:

Two hard drives (Serial ATA)
One floppy drive
One flexbay drive
Two CD or DVD drives

Connecting Drive Cables

When you install a drive, you connect two cables—a DC power cable and a data cable—to the back of the drive and to the
system board. Some CD/DVD drives may also have an audio connector; one end of the audio cable will attach to the drive

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connector and the other will attach to the system board.

Connect hard drives to data connectors labeled "SATA" and connect CD/DVD drives to connectors labeled "IDE".

When you connect two IDE devices to a single IDE interface cable and configure them for the cable select setting, the device
attached to the last connector on the interface cable is primary or the boot device (drive 0), and the device attached to the
middle connector on the interface cable is the secondary device (drive 1). See the drive documentation in your upgrade kit for
information on configuring devices for the cable select setting.

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 (indicated by the colored
stripe along one edge of the IDE cable—serial ATA cables do not use a colored stripe) 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 the board or
card.

NOTICE: When you connect an IDE interface cable, do not place the colored stripe away from pin 1 of the connector.

Reversing the cable prevents the drive from operating and could damage the controller, the drive, or both.

When connecting an IDE cable, ensure that you align the colored stripe with the pin 1 connector. When disconnecting an IDE
cable, grasp the colored pull tab and pull until the connector detaches.

When connecting and disconnecting a serial ATA cable, hold the cable by the connector at each end. Like IDE connectors, the
serial ATA 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.

Hard Drive

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

Product Information Guide.

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

opening 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. If you are replacing a hard drive that contains data you want to keep, back up your files before you begin this
procedure.

2. Follow the procedures in "Before You Begin

3. Remove the computer cover

.

."

Removing a Hard Drive

1. Disconnect the power and SATA data cables from the drive.

2. Press the tabs on each side of the drive towards each other and slide the drive up and out.

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Installing a Hard Drive

1. Unpack the replacement hard drive, and prepare it for installation.

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

3. If your replacement hard drive does not have the hard drive bracket attached, remove the bracket from the old hard
drive by unsnapping it from the drive.

4. Snap the hard drive bracket onto the replacement hard drive.

5. Install the hard drive into the computer by sliding the drive into place until you feel it click into place.

6. Connect the power and SATA data cables to the hard drive.

7. Check all connectors to be certain that they are properly cabled and firmly seated.

8. Replace the computer cover

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

the computer.

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

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See the documentation that came with the hard drive for instructions about installing any software required for the
operation of the hard drive.

10. If the drive you just installed is the primary drive, insert bootable media into drive A.

11. Turn on the computer.

12. Enter system setup, and update the appropriate Primary Drive option (0 or 1).

13. Exit system setup, and reboot the computer.

14. Partition and logically format your drive before you proceed to the next step.

See the documentation for your operating system for instructions.

15. Test the hard drive by running the Dell Diagnostics.

16. If the drive you just installed is the primary drive, install your operating system on the hard drive.

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

opening 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. Press in on the tabs on each side of the hard drive bracket in the empty drive bay and slide the bracket up and out.

4. Snap the hard drive bracket onto the new hard drive.

NOTICE: Do not install any drive into the lower hard-drive bay until you have removed the hard drive bracket from

the inside of the hard drive bay.

5. Slide the new hard drive into empty bay until you feel a click.

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

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

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

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

8. Check all connectors to be certain that they are properly cabled and firmly seated.

9. Replace 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.

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

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

opening the cover.

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NOTE: If you are adding a floppy drive, see "Installing a Floppy Drive."

Removing a Floppy Drive

1. Follow the procedures in "Before You Begin."

2. Remove the computer cover

3. Disconnect the power and floppy drive cables from the back of the floppy drive.

4. Disconnect the other end of the floppy-drive cable from the system board

.

5. Pull the sliding plate to the right and hold in place.

6. Slide the floppy drive out of the floppy drive bay.

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Installing a Floppy Drive

1. If you are installing a new floppy drive, remove the shoulder screws from the inside of the drive-panel insert and
attach the screws to the new drive.

2. Slide the floppy drive into the floppy drive bay until the sliding plate clicks into place and the drive snaps into position.

3. Attach the power and floppy-drive cables to the floppy drive.

4. Connect the other end of the floppy-drive cable to the connector labeled "FLOPPY" on the system board. For more
information on the system board, see "System Board Components

."

5. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.

6. Replace the computer cover

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

computer.

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

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

8. Enter system setup

9. Verify that your computer works correctly by running the Dell Diagnostics.

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. Lay the computer on its side so that the system board is on the bottom of the inside of the computer.

3. Remove the computer cover

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4. Remove the drive panel.

5. Disconnect the USB cable on the back of the Media Card Reader from the front panel USB connector on the system
board (see "System Board Components

") and remove the cable from the clip on the shroud.

6. While pushing on the back of the drive, remove the Media Card Reader by sliding and holding the sliding plate.

7. Replace the drive panel

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8. Replace the computer cover.

Installing 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. Lay the computer on its side so that the system board is on the bottom of the inside of the computer.

3. Remove the computer cover

4. Remove the drive panel

5. Remove the Media Card Reader from its packaging and ensure that all four screws are included.

6. Gently slide the drive 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.

7. Connect the FlexBay USB cable to the back of the Media Card Reader and to the Media Card Reader connector on the
system board (see "System Board Components

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8. Insert the Media Card Reader into the bay and slide the drive in to seat it in the computer.

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

10. Replace the computer cover

.

CD/DVD 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

opening the cover.

Removing a CD/DVD Drive

1. Follow the procedures in "Before You Begin."

2. Remove the computer cover

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

.

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

Installing a CD/DVD Drive

1. 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. If you are
installing an IDE drive, configure the drive for the cable select setting.

2. If you are installing a new drive, remove the three shoulder screws from the inside of the drive- panel insert and attach
the screws to the new drive.

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

4. Connect the power cable to the drive and the CD/DVD cable to the drive and system board.

5. If you are installing a new CD/DVD drive rather than replacing a drive, remove the front panel inserts.

6. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.

7. Replace the computer cover

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

computer.

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

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

9. Enter system setup

10. Verify that your computer works correctly by running the Dell Diagnostics.

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

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.

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

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

5. Press the release button located on the floor of the computer frame.

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

6. Slide the power supply approximately 1 inch closer to the front of the computer.

7. Lift the power supply out of the computer.

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Replacing 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. Connect the AC power cable to the connector.

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

6. Replace 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.

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

.

Processor

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

Product Information Guide.

Removing the Processor

1. Follow the procedures in "Before You Begin."

2. Remove the computer cover

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 press the release tab downward to release the mechanism from the two

tab slots holding it in place.

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b. Set the retention mechanism aside in a secure location.

4. Use a long Phillips screwdriver to loosen the two captive screws on each side of the heat-sink assembly.

CAUTION: Despite having a plastic shield, the heat-sink assembly may be very hot during normal

operation. Be sure that it has had sufficient time to cool before you touch it.

5. Rotate the heat-sink assembly toward the rear of the computer, and remove it from the computer.

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.

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6. 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 socket
4 release lever

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

NOTICE: When the release lever is freed, the processor may shift in place. Before securing the processor cover after it

has been opened, ensure that the notches on the processor are aligned with the notches on the socket.

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.

8. Gently remove the processor from the socket.

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.

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

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.

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 capture screws.

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NOTICE: Ensure that the heat sink is correctly seated and secure.

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

9. Replace 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.

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

.

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.

I/O-Panel Components

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1 USB ports
2 diagnostic, hard-drive activity, and network lights
3 headphones connector
4 microphone connector

Removing the I/O Panel

1. Follow the procedures in "Before You Begin."

2. Remove the computer cover

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 press the release tab downward to release the mechanism from the two

tab slots holding it in place.

.

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b. Set the retention mechanism aside in a secure location.

4. Use a long Phillips screwdriver to loosen the two captive screws on each side of the heat-sink assembly.

CAUTION: Despite having a plastic shield, the heat-sink assembly may be very hot during normal

operation. Be sure that it has had sufficient time to cool before you touch it.

5. Rotate the heat-sink assembly towards the rear of the computer, and remove it from the computer.

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

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

7. Disconnect the system fan cable from the system board.

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

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

9. Lift the fan release lever, then slide the fan toward the back of the computer to release it from the bottom cover.

10. Remove the fan from the computer.

11. Disconnect the control-panel cable from the I/O panel connector by pulling with the cable loop.

12. Remove the drive panel

13. If an optional sound card is installed, disconnect the cable from the edge of the I/O panel.

14. If an optional IEEE 1394 cable is installed in the front port, remove the cable from the front of the computer by
following the instructions that came with the connector.

15. Remove the mounting screw from the I/O panel.

.

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16. Remove the I/O panel from the computer.

Replacing the I/O Panel

Follow the removal procedure in reverse order, ensuring that the tabs on the top panel, bottom panel, and front panel are
secure.

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.

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 you have turned 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

2. Follow the procedures in "Before You Begin

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3. Remove the computer cover.

4. Locate the battery socket.

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.

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, and snap the battery into place.

7. Replace 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 turn them on.

9. Enter system setup

CAUTION: For instructions about how to safely dispose of a battery, see your Product Information Guide.

10. Properly dispose of the old battery.

and restore the settings you recorded in step 1.

System Board

Removing the System Board

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

opening the cover.

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

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dissipate any static electricity that could harm internal components.

1. Shut down the computer through the Start menu.

2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not
automatically turn off when you shut down your computer, turn them off now.

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

network port or device.

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

4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to
ground the system board.

5. Open the computer cover

6. Remove any components that restrict access to the system board (CD/DVD drive(s), floppy drive, hard drive, I/O
panel).

7. Remove the heat-sink assembly and processor.

8. Disconnect all cables from the system board.

.

1 system board
2 screws (10)

9. Remove the 10 screws from the system board.

10. Slide the system board assembly toward the front of the computer, and then lift the board away.

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

Replacing the System Board

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

2. Replace the screws on the system board.

3. Replace any components and cables that you removed from the system board.

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

5. Replace 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 turn them on.

Back to Contents Page

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Back to Contents Page

Replacing the Computer Cover

Dell™ XPS™ 400 Service Manual

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, and fold cables out of the way.

Gently pull the power cables toward you so that they do not get caught underneath the drives.

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

3. Close the cover:
a. Pivot the cover down.
b. Press down on the right side of the cover until it closes.

c. Press down on the left side of the cover until it closes.

d. Ensure that both sides of the cover are locked. If not, repeat all of Step 3.

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

computer.

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

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