Dell OptiPlex 780 User Manual

Dell™ OptiPlex™ 780 Service Manual

Desktop Computer

Working on Your Computer

Removing and Replacing Parts

Specifications

Diagnostics

System Setup

Notes, Cautions, and Warnings

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

CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed.

WARNING: A WARNING 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. © 2009 Dell Inc. All rights reserved.

Reproduction of this material in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, OptiPlex are trademarks of Dell Inc.; Intel, Core, and Celeron are registered trademarks of Intel Corporation in the U.S. and other countries; Microsoft, Windows, Windows Server, MS-DOS and Windows Vista are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries.

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.

October 2012

Rev. A02

Working on Your Computer

Dell™ OptiPlex™ 780 Service Manual—Desktop

Before Working Inside Your Computer

Recommended Tools

Turning Off Your Computer

After Working Inside Your Computer

Before Working Inside Your Computer

Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that the following conditions exist:

You have performed the steps in Working on Your Computer.

You have read the safety information that shipped with your computer.

A component can be replaced or—if purchased separately—installed by performing the removal procedure in reverse order.

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.

CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface, such as a connector on the back of the computer.

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.

CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some cables have connectors 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.

NOTE: The color of your computer and certain components may appear differently than shown in this document.

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

1.Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.

2.Turn off your computer (see Turning Off Your Computer).

CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.

3. Disconnect all network cables from the computer.

5.Disconnect your computer and all attached devices from their electrical outlets.

6.Press and hold the power button while the system is unplugged to ground the system board.

7.Remove the cover.

CAUTION: 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 static electricity, which could harm internal components.

Recommended Tools

The procedures in this document may require the following tools:

Small flat-blade screwdriver

Phillips screwdriver

Small plastic scribe

Flash BIOS update program CD (see the Dell Support website at support.dell.com)

Turning Off Your Computer

CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your computer.

1. Shut down the operating system:

In Windows Vista®:

Click Start , then click the arrow in the lower-right corner of the Start menu as shown below, and then click

Shut Down.

In Windows® XP:

Click Start→ Turn Off Computer→ Turn Off.

The computer turns off after the operating system shutdown process is complete.

2.Ensure that the computer and all 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 about 6 seconds to turn them off.

After Working Inside Your Computer

After you complete any replacement procedure, ensure you connect any external devices, cards, and cables before turning on your computer.

1. Replace the cover.

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

2.Connect any telephone or network cables to your computer.

3.Connect your computer and all attached devices to their electrical outlets.

4.Turn on your computer.

5.Verify that the computer works correctly by running the Dell Diagnostics. See Dell Diagnostics.

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Removing and Replacing Parts

Dell™ OptiPlex™ 780 Service Manual—Desktop

Cover	Optical Drive
Primary Hard Drive	Secondary Hard Drive (Optional)
Floppy Drive (Optional)	Riser Cage
Expansion Card	Standard Back Plate
Memory	Heat Sink and Processor
Power Supply	Coin-Cell Battery
Fan	IO Panel
System Board

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Technical Specifications

Processor	Controls and Lights
Memory	Network
Expansion Bus	Audio
Video	Power
System Information	System Board Connectors
Cards	Physical
Drives	Environmental
External Connectors

NOTE: Offerings may vary by region. For more information regarding the configuration of your computer, click Start→ Help and Support and select the option to view information about your computer.

NOTE: Unless otherwise stated, the specifications are identical for mini-tower, desktop, and small form factor computers.

Processor
Type	Intel® Core™2 Duo; FSB up to 1333 MHz
	Intel Core 2 Quad; FSB up to 1333 MHz
	Intel Pentium® Dual Core; FSB up to
	1066 MHz
	Intel Celeron®; FSB up to 800 MHz
Level 2 (L2) cache	at least 512 KB pipelined-burst, eight-
	way set associative, writeback SRAM
Memory
Type	DDR3 SDRAM (non-ECC memory only)
Speed	1067 MHz
Connectors	four
Capacity	1 GB, 2 GB or 4 GB non-ECC
Minimum memory	1 GB
Maximum memory	16 GB
Video
Integrated	Intel graphics media accelerator X4500
	up to 256 MB shared video memory (total
	system memory greater than 512 MB)
Discrete	PCI Express x16 slot supports either a PCI
	Express card or a DVI add-on card (for
	dual-monitor support)
Audio
Integrated	Intel high definition audio

Network
Integrated	Intel integrated network interface card
	capable of 10/100/1000 Mb/s
	communication
System Information
Chipset	Intel® Q45 Express chipset w/ICH10DO
DMA channels	eight
Interrupt levels	24
BIOS chip (NVRAM)	64 Mb
Expansion Bus
Bus type	PCI 2.3
	PCI Express 2.0
	SATA 1.0A and 2.0
	eSATA
	USB 2.0
Bus speed	PCI: 133 MB/s
	PCI Express:
	x1-slot bidirectional speed — 250
	MB/s
	x16-slot bidirectional speed — 8
	GB/s
	SATA: 1.5 Gbps and 3.0 Gbps
	eSATA: 3.0 Gbps
	USB: 480 Mbps

Cards

PCI

Mini-tower

Desktop

Small form factor

up to two full height cards

without riser card — up to two low profile cards

with riser card — up to two full height cards

one low profile card

PCI Express x1
Mini-tower	one full height card
Desktop	none
Small form factor	none
PCI Express x16
Mini-tower	one full height card
Desktop	without riser — one low profile card
	with riser — one full height card

	Small form factor	one low profile card
	NOTE: The PCI Express x16 slot is disabled when a display is connected to the
	integrated video connector.
	Drives
	Externally accessible
	5.25 inch drive bay(s)	for SATA DVD-ROM, DVD+/-RW, or CD
	Mini-tower	+/-RW drives
		two bays
	Desktop
		one bay
	Small form factor
		one slimline bay
	3.5 inch drive bay	for 19-in-1 Media Card Readers
	Mini-tower	one bay
	Desktop	one bay
	Small form factor	one slimline bay
	Internally accessible
	3.5 inch drive bay(s)	for hard drives
	Mini-tower	two bays
	Desktop	one bay
	Small form factor	one bay

NOTE: Your computer can support up to two 2.5 inch hard drives with brackets.

External Connectors
Audio
Back panel	two connectors for line-in/ microphone
	and line-out
Front panel	two front-panel connectors for
	headphones and microphone
eSATA	one 7-pin connector
Network	one RJ45 connector
Parallel	one 25-pin connector (bidirectional)
Serial	one 9-pin connector; 16550C-compatible
USB
Front panel	two connectors
Back panel	six connectors
Video	one 15-hole VGA connector
	one 20-pin DisplayPort connector
System Board Connectors
PCI 2.3	data width (maximum) — 32 bits
Mini-tower	two 120-pin connectors

Desktop		two 120-pin connectors
Small form factor		one 120-pin connector
PCI Express x1		data width (maximum) — one PCI Express
Mini-tower		lane
		one 36-pin connector
Desktop
		not applicable
Small form factor
		not applicable
PCI Express x16		one 164-pin connector
		data width (maximum) — 16 PCI Express
		lanes
Serial ATA
Mini-tower		four 7-pin connectors
Desktop		three 7-pin connectors
Small form factor		three 7-pin connectors
Memory		four 240-pin connectors
Internal USB device		one 10-pin connector (supports two USB
		ports)
Processor fan		one 5-pin connector
Hard-drive fan		one 5-pin connector
Front panel control		one 40-pin connector
Processor		one 775-pin connector
Power 12V		one 4-pin connector
Power		one 24-pin connector
Controls and Lights
Front of the computer
Power button		push button
Power light		blinking green — indicates that the
		computer is in sleep state
		solid green — indicates that the computer
		is in power-on state
		blinking amber — indicates a problem
		with the system board
		solid amber — indicates that the system
		board is unable to initialize
Drive activity light		blinking green — indicates that the
		computer is reading data from or writing
		data to the hard drive
Network connectivity light		green — indicates that a good connection
		exists between the network and the
		computer
		off (no light) — indicates that the
		computer is not detecting a physical
		connection to the network

Diagnostic lights

Back of the computer

Link integrity light on integrated network adapter

Network activity light on integrated network adapter

four lights. For more information, see Diagnostics.

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

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

yellow — a good 1000 Mbps connection exists between the network and the computer.

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

yellow light — A blinking yellow light indicates that network activity is present.

Power
DC power supply
Wattage
Mini-tower	305	W (non-EPA) or 255 W (EPA)
Desktop	255	W (EPA)
Small form factor	235	W (EPA)
Maximum heat dissipation
Mini-tower	1041 BTU/hr
Desktop	955	BTU/hr
Small form factor	938	BTU/hr
Voltage	90–265 VAC, 50/60 Hz
Coin-cell battery	3 V CR2032 lithium coin cell

NOTE: Heat dissipation is calculated by using the power supply wattage rating.

NOTE: See the safety information that shipped with your computer for important voltage setting information.

Physical
Height
Mini-tower	40.80 cm (16.10 inches)
Desktop	11.40 cm (4.50 inches)
Small form factor	9.26 cm (3.65 inches)
Width
Mini-tower	18.70 cm (7.40 inches)
Desktop	39.90 cm (15.70 inches)
Small form factor	31.40 cm (12.40 inches)
Depth

Mini-tower	43.30 cm (17.00 inches)
Desktop	35.30 cm (13.90 inches)
Small form factor	34.00 cm (13.40 inches)
Weight
Mini-tower	11.70 kgs (25.80 lbs)
Desktop	8.26 kgs (18.20 lbs)
Small form factor	6.80 kgs (15.00 lbs)
Environmental
Temperature
Operating	10° to 35°C (50° to 95°F)
Storage	–40° to 65°C (–40° to 149°F)
Relative humidity (noncondensing)	operating: 20% to 80% (maximum wet
	bulb temperature: 29°C)
	storage: 5% to 95% (maximum wet bulb
	temperature: 38°C
Maximum vibration
Operating	5 to 350 Hz at 0.0002 G	2	/Hz
Storage	5 to 500 Hz at 0.001 to 0.01 G			2	/Hz
Maximum shock
Operating	40 G +/- 5% with pulse duration of 2
	msec +/- 10% (equivalent to 20 in/sec
	[51 cm/sec])
Storage	105 G +/- 5% with pulse duration of 2
	msec +/- 10% (equivalent to 50 in/sec
	[127 cm/sec])
Altitude
Operating	–15.2 to 3048 m (–50 to 10,000 ft)
Storage	–15.2 to 10,668 m (–50 to 35,000 ft)
Airborne contaminant level	G2 or lower as defined by ISA-S71.04-
	1985

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Diagnostics

Dell™ OptiPlex™ 780 Service Manual

Dell Diagnostics

Power Button Light Codes

Beep Codes

Diagnostic Lights

Dell Diagnostics

When to Use the Dell Diagnostics

It is recommended that you print these procedures before you begin.

NOTE: The Dell Diagnostics software works only on Dell computers.

NOTE: The Drivers and Utilities media is optional and may not ship with your computer.

Enter system setup (see Entering System Setup), review your computer's configuration information, and ensure that the device you want to test displays in System Setup and is active.

Start the Dell Diagnostics from either your hard drive or from the Drivers and Utilities media.

Starting the Dell Diagnostics From Your Hard Drive

1.Turn on (or restart) your computer.

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

NOTE: If you see a message stating that no diagnostics utility partition has been found, run the Dell Diagnostics from your Drivers and Utilities media.

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.

3.When the boot device list appears, highlight Boot to Utility Partition and press <Enter>.

4.When the Dell Diagnostics Main Menu appears, select the test that you want to run.

Starting the Dell Diagnostics From the Drivers and Utilities Disc

1.Insert the Drivers and Utilities disc.

2.Shut down and restart the computer.

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

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

NOTE: The next steps change the boot sequence for one time only. On the next startup, the computer boots according to the devices specified in the system setup program.

3. When the boot device list appears, highlight Onboard or USB CD-ROM Drive and press <Enter>.

4.Select the Boot from CD-ROM option from the menu that appears and press <Enter>.

5.Type 1 to start the menu and press <Enter> to proceed.

6.Select Run the 32 Bit Dell Diagnostics from the numbered list. If multiple versions are listed, select the version appropriate for your computer.

7.When the Dell Diagnostics Main Menu appears, select the test you want to run.

Dell Diagnostics Main Menu

1. After the Dell Diagnostics loads and the Main Menu screen appears, click the button for the option you want.

Option	Function
Express	Performs a quick test of devices. This test typically takes 10 to 20 minutes and requires no interaction on your
Test	part. Run Express Test first to increase the possibility of tracing the problem quickly.
Extended	Performs a thorough check of devices. This test typically takes 1 hour or more and requires you to answer
Test	questions periodically.
Custom	Tests a specific device. You can customize the tests you want to run.
Test
Symptom	Lists the most common symptoms encountered and allows you to select a test based on the symptom of the
Tree	problem you are having.

2.If a problem is 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 and follow the instructions on the screen.

3.If you run a test from the Custom Test or Symptom Tree option, click the applicable tab described in the following table for more information.

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 may indicate requirements for running the test.

Configuration Displays your hardware configuration for the selected device.

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. The device list may not display the names of all the components installed on your computer or all devices attached to your computer.

Parameters

Allows you to customize the test by changing the test settings.

4.When the tests are completed, if you are running the Dell Diagnostics from the Drivers and Utilities disc, remove the disc.

5.Close the test screen to return to the Main Menu screen. To exit the Dell Diagnostics and restart the computer, close the Main Menu screen.

Power Button Light Codes

The diagnostic lights give much more information about the system state, but legacy power light states are also supported in your computer. The power light states are shown in following table.

Power

Light Description

State

Off

Blinking

Amber

Solid

Amber

Blinking

Green

Solid

Green

Power is off, light is blank.

Initial state of light at power up.

Indicates system has power, but the POWER_GOOD signal is not yet active.

If the Hard Drive light is off, it is probable that the power supply needs to be replaced.

If the Hard Drive light on, it is probable that an onboard regulator or VRM has failed. Look at the diagnostic lights for further information.

Second state of the light at power up. Indicates the POWER_GOOD signal is active and it is probable that the power supply is fine. Look at the diagnostic lights for further information.

System is in a low power state, either S1 or S3. Look at the diagnostic lights to determine which state the system is in.

System is in S0 state, the normal power state of a functioning machine.

The BIOS will turn the light to this state to indicate it has started fetching op-codes.

Beep Codes

If the monitor cannot display error messages during the POST, the computer may emit a series of beeps that identifies the problem or that can help you identify a faulty component or assembly. The following table lists the beep codes that may be generated during the POST. Most beep codes indicate a fatal error that prevents the computer from completing the boot routine until the indicated condition is corrected.

Code	Cause
1-1-2	Microprocessor register failure
1-1-3	NVRAM read/write failure
1-1-4	ROM BIOS checksum failure
1-2-1	Programmable interval timer failure
1-2-2	DMA initialization failure
1-2-3	DMA page register read/write failure
1-3	Video Memory Test failure

1-3-1 through 2-4-4 Memory not being properly identified or used

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	Invalid 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 timer tick
4-2-2	Shutdown failure
4-2-3	Gate A20 failure
4-2-4	Unexpected interrupt in protected mode
4-3-1	Memory failure above address 0FFFFh
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
4-4-2	Failure to decompress code to shadowed memory
4-4-3	Math-coprocessor test failure
4-4-4	Cache test failure

Diagnostic Lights

To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the bank panel. When the computer starts normally, the lights flash before turning off. If the computer malfunctions, the sequence of the lights help to identify the problem.

NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.

Light Pattern

Problem Description

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

The diagnostic lights are not lit after the computer successfully boots to the operating system.

A possible processor failure has occurred.

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

Suggested Resolution

Plug the computer into a working electrical outlet.

If the problem persists, contact Dell.

Reseat the processor (see Processor information for your computer). If the problem persists, contact Dell.

If two or more memory modules are installed, remove the modules, then reinstall one module 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 working memory of the same type into your computer.

If the problem persists, contact Dell.

A possible graphics card failure has occurred.

A possible floppy drive or hard drive failure has occurred.

A possible USB failure has occurred.

Reseat any installed graphics cards.

If available, install a working graphics card into your computer. If the problem persists, contact Dell .

Reseat all power and data cables.

Reinstall all USB devices and check all cable connections.

No memory modules		If two or more memory modules are installed, remove the modules, then
are detected.		reinstall one module 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 working memory of the same type into your
		computer.
		If the problem persists, contact Dell.
Memory modules are		Ensure that no special requirements for memory module/connector
detected, but a memory		placement exist.
configuration or		Ensure that the memory you are using is supported by your computer
compatibility error has		(see the "Specifications" section for your computer).
occurred.		If the problem persists, contact Dell.
A possible expansion		Determine if a conflict exists by removing an expansion card (not a
card failure has		graphics card) and restarting the computer.
occurred.		If the problem persists, reinstall the card you removed, then remove a
		different card and restart the computer.
		Repeat this process for each expansion card installed. If the computer
		starts normally, troubleshoot the last card removed from the computer
		for resource conflicts.
		If the problem persists, contact Dell.
Another failure has		Ensure that all hard drive and optical drive cables are properly
occurred.		connected to the system board .
		If there is an error message on the 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 optical drive), check system setup to ensure the boot
		sequence is correct for the devices installed on your computer.
		If the problem persists, contact Dell.

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System Setup

Dell™ OptiPlex™ 780 Service Manual—Mini-Tower, Desktop, and Small Form Factor

Boot Menu

Navigation Keystrokes

Entering System Setup

System Setup Simulation

System Setup Menu Options

Boot Menu

Press <F12> when the Dell™ logo appears to initiate a one-time boot menu with a list of the valid boot devices for the system.

The options listed are:

Internal HDD

CD/DVD/CD-RW Drive

Onboard NIC

BIOS Setup

Diagnostics

This menu is useful when you are attempting to boot to a particular device or to bring up the diagnostics for the system. Using the boot menu does not make any changes to the boot order stored in the BIOS.

Navigation Keystrokes

Use the following keystrokes to navigate the System Setup screens.

	Navigation Keystrokes
Action	Keystroke
Expand and collapse field	<Enter>, leftor right-arrow key, or +/–
Expand or collapse all fields	< >
Exit BIOS	<Esc>—Remain in Setup, Save/Exit, Discard/Exit
Change a setting	Left or right-arrow key
Select field to change	<Enter>
Cancel modification	<Esc>
Reset defaults	<Alt><F> or Load Defaults menu option

Entering System Setup

Your computer offers the following BIOS and System Setup options:

Bring up a one-time boot menu by pressing <F12>

Access System Setup by pressing <F2>

<F12> Menu

Press <F12> when the Dell™ logo appears to initiate a one-time boot menu with a list of the valid boot devices for the computer. Diagnostics and Enter Setup options are also included in this menu. The devices listed on the boot menu depend on the bootable devices installed in the computer. This menu is useful when you are attempting to boot to a particular device or to bring up the diagnostics for the computer. Making changes in the boot menu does not make any changes to the boot order stored in the BIOS.

<F2>

Press <F2> to enter System Setup and make changes to user-definable settings. If you have trouble entering System Setup using this key, press <F2> when the keyboard lights first flash.

System Setup Menu Options

NOTE: System Setup options may vary depending on your computer and may not appear in the exact same order.

General
System	Displays the following information:
Board	System information: Displays BIOS Info,, System Info, Service Tag, Express Service Code, Asset Tag, Manufacture Date, and the
	Ownership Date..

		Memory information: Displays Installed Memory, Usable Memory, Memory Speed, Memory Channel Mode, Memory Technology,
		DIMM_1 Size, DIMM_2 Size, DIMM_3 Size, and DIMM_4 Size. .
		Processor information: Displays the Processor Type, Processor Speed, Processor Bus Speed, Processor L2 cache, Processor ID,
		Microcode Version, Multi Core Capable and HT Capable 64-bit Technology..
		PCI information: Displays available slots on the system board.
Date/Time		Displays the system date and time. Changes to the system date and time take effect immediately.
Boot		Specifies the order in which the computer attempts to find an operating system from the devices specified in this list.
Sequence		Onboard or USB Floppy
		HDD(will show the model currently in system)
		Onboard or USB CD-Rom Drive
		USB Device

	Drives
	Diskette drive	This field determines how the BIOS configures floppy drives, Operating Systems with USB support will recognize USB Floppy drives regardless of
		this setting:
			Disable - All Floppy drive are disable
			Enable - All floppy drive are enable.
		The "USB Controller" Setup option will affect floppy operation.
	SATA	configures the operating mode of the integrated hard drive controller.
	Operation		RAID Autodetect / AHCI = RAID if signed drives, otherwise AHCI
			RAID Autodetect / ATA= RAID if signed drives, otherwise ATA
			RAID On / ATA= SATA is configured for RAID on every boot
			Legacy = The hard drive controller is configured for legacy mode
		Legacy mode provides for compatibility with some older operating systems that do not support native resources assigned to the drive controller.
		RAID Mode is incompatible with ImageServer. Please disable RAID mode if enabling Image Server.
	S.M.A.R.T.	This field controls whether hard drive errors for integrated drives are reported during system startup. This technology is part of the SMART(Self
	Reporting	Monitoring Analysis and Reporting Technology) specification.
		This option is disabled by default.
	Drives	Enables or disables the SATA or ATA drives connected to the system board.
	System Configuration
	Integrated NIC		Enables or disables the integrated network card. You can set the integrated NIC to:
			Disable
			Enable (default)
			Enable with PXE
			Enable with ImageSever
			ImageServe is incompatible with RAID mode. Please disable RAID if enabling ImageServer.
			PXE is needed only if intending to boost to an operating system located on a server, not if you are booting on an OS located on a hard drive in
			this system.
			This field enable and disable the internal USB for Flex Bay, you can set:
	USB for Flex bay		Disable - Internal USB for Flex Bay is disable
			Enable - Internal USB for Flex Bay is enable
			No Boot - Internal USB for Flex Bay is enable, but not bootable. (default)
	USB Controller		Enables or disables the integrated USB controller. You can set the USB controller to:
			Enable (default)
			Disable
			No boot
			Operating systems with USB support will recognize USB Storage
	Parallel Port		Identifies and defines the parallel port settings. You can set the parallel port to:
			Disable
			AT
			PS/2 (default)
			EPP
			ECP No DMA
			ECP DMA 1
			ECP DMA 3
	Parallel Port		Sets the base I/O address of the integrated parallel port.
	Address
	Serial Port #1		Identifies and defines the serial port settings. You can set the serial port to:

Disable

Auto (default)

COM1

COM3

		The Operating System may allocate resources even though the setting is disabled.
Serial Port #2		Identifies and defines the serial port settings. You can set the serial port to:
		Disable
		Auto (default)
		COM2
		COM4
		The Operating System may allocate resources even though the setting is disabled.
Miscellaneous		Enables or disables the following onboard devices:
Devices		Front USB
		Rear Dual USB
		Rear Quad USB
		PCI slots
		Audio

Video
Primary	This field determines which video controller will become the primary video controller when 2 controllers are available in the system. This selection
Video	matters only if there are 2 video controller present.
	Auto(default) - Use the add-in video controller.
	Onboard/Card - Use the integrated video controller unless a Graphic care is installed. A PCI Express Graphic(PEG) card will override and disable
	the integrated video controller.

Performance
Multi Core	This field specifies whether the processor will have one or all cores enable. The performance of some application will improve with the additional
Support	cores.
Intel®	This Option enables or disables the Intel® SpeedStep™ mode of the processor. When disabled, the system is placed into the highest performance
SpeedStep™	state and the Intel® SpeedStep™ applet or native operating system driver are prevented from adjusting the processor's performance. When enable.
	the Intel® SpeedStep™, enabled CPU is allowed to operate in multiple performance states.

	This option is disabled by default.
C States	This option enables or disables additional processor sleep states. The operating system may optionally use these for additional power saving when
	idle.
Control	This option is disabled by default.
Limit CPUID	This field limits the maximum value the processor Standard CPUID Function will support. Some operating systems will not complete installation when
Value	the maximum CPUID Function supported is greater than 3.
	This option is disabled by default.
HDD	This option allows you to optimize your hard drives performance and acoustic noise level based on your personal preferences.
Acoustic		Bypass(default)- Do nothing (needed for older drives)
Mode
		Quiet- The drive is slower, but quieter.
		Suggested - Allow drive manufacturer to select the mode.
		Performance- The drive is faster, but possibly noisier.
Virtualization Support
	This Option specifies whether a Virtual Machine Monitor (VMM) can utilize the additional hardware capabilities provided by Intel® Virtualization
Virtualization	Technology.
	Enable Intel® Virtualization Technology - This option is disabled by default.
VT for Direct	Enables or disables the Virtual Machine Monitor (VMM) from utilizing the additional hardware capabilities provided by Intel® Virtualization technology
I/O	for direct I/O.
	Enable Intel® Virtualization Technology for Direct I/O - This option is disabled by default.
Trusted	Field specifies whether a Measured Virtual Machine(MVMM) can utilize the additional hardware capabilities provided by Intel® Trusted Execution
	Technology. The TPM Virtualization Technology and Virtualization Technology for Direct I/O must be enable to use this feature.
Execution	Enable Intel® Trusted Execution Technology - This option is disabled by default.
Security
Administrative		Provides restricted access to the computer's system setup program in the same way that access to the system can be restricted with the
Password		System Password option.
		This option is not set by default.
System Password		Displays the current status of the system's password security feature and allows a new system password to be assigned and verified.
		This option is not set by default.
Password Changes		Enables or disables the user from changing the system password without the administrative password.
		This option is enabled by default.
TPM Security		Enables or disables the trusted platform module (TPM) security.

			You can set the TPM security to:
			Deactivate (default)
			Activate
			Clear
			NOTE: When TPM Security is set to Clear the system setup program clears the user information stored in the TPM.
CPU XD Support			Enables or disables the execute disable mode of the processor.
			This option is enabled by default.
Computrace(R)			Enables or disables the optional Computrace® service designed for asset management.
			You can set this option to:
			Deactivate (default)
			Disable
			Activate
SATA-0 Password			Displays the current status of the password set for the hard drive connected to the SATA-0 connector on the system board.
			You can also set a new password. This option is not set by default.
			NOTE: The system setup program displays a password for each of the hard drives connected to your system board.
Power Management
AC Recovery	Determines how the system responds when AC power is re-applied after a power loss. You can set the AC Recovery to:
			Power Off (default)
			Power On
			Last State
Auto On Time	Sets time to automatically turn on the computer.
	Time is kept in the standard 12-hour format (hours:minutes:seconds).
	Change the startup time by typing the values in the time and AM/PM fields.
	NOTE: This feature does not work if you turn off your computer using the switch on a power strip or surge protector or if Auto Power On is set
	to disabled.
Low Power	Enables or disables low power mode.
Mode	This option is disabled by default.
	When low power mode is enabled, the integrated network card is disabled when the system is shutdown or in Hibernate mode. Only Add-in NIC
	cards will be able to remotely wake the system.
Remote Wake	Allows the system to power up when a network interface controller receives a wake up signal. You can set Remote Wake up to:
up			Disable (default)
			Enable
			Enable with Boot NIC
Suspend Mode	Sets the power management suspend mode to:
			S1
			S3 (default)
	NOTE: If the AMT Management Engine (ME) of the system is disabled, the S1 suspend mode is unavailable in the system setup.
Fan Control	Controls the speed of the system fan.
Override	NOTE: When enabled, the fan runs at full speed.
Maintenance
Service Tag			Displays the Service Tag of your computer.
Asset Tag			Allows you to create a system asset tag if an asset tag is not already set.
			This option is not set by default.
SERR Messages			Controls the SERR Message mechanism.
			This option is enabled by default.
			Some graphics cards require the SERR Message mechanism be disabled.
Image Server
Lookup Method			Specifies how the ImageServer looks for the server address.
			Static IP
			DNS
			NOTE: You must set the Integrated NIC to Enable with ImageServer to set the Lookup Method.
ImageServer IP			Specifies the primary static IP address of the ImageServer with which the client software communicates.

			The default IP address is 255.255.255.255
			NOTE: You must set the Integrated NIC to Enable with ImageServer to set the ImageServer IP.
ImageServer Port			Specifies the primary IP port of the image server with which the client software communicates.
			The default IP port is 06910.
Client DHCP			Specifies how the client obtains the IP address.
			Static IP
			DHCP (default)
Client IP			Specifies the static IP address of the client.
			The default IP address is 255.255.255.255
			NOTE: To set the Client IP you must set the Client DHCP to the Static IP
Client SubnetMask			Specifies the subnet mask for the client.
			The default setting is 255.255.255.255
			NOTE: To set Client Subnet Mask you must set Client DHCP to Static IP
Client Gateway			Specifies the gateway IP address for the client.
			The default setting is 255.255.255.255
			NOTE: To set Client Subnet Mask you must set Client DHCP to Static IP
License Status			Displays the current license status.
Post Behavior
Fast Boot	When enabled (default), your computer starts more quickly because it skips certain configurations and tests.
NumLock	Enables or disables the NumLock feature when your computer starts.
LED	When enabled (default), this option activates the numeric and mathematical features shown at the top of each key. When disabled, this option activates
	the cursor-control functions labeled on the bottom of each key
POST	Allows you to specify the function keys to display on the screen when the computer starts.
Hotkeys		Enable F2 = Setup (enabled by default)
		Enable F12 = Boot menu (enabled by default)
Keyboard	Enables or disables keyboard error reporting when the computer starts.
Errors	This option is enabled by default.
MEBx	sign-on displays a message stating the keystroke sequence required to enter the Manageability Engine BIOS Extensions(MEBx) Setup program.
Hotkey	This option is enabled by default.
	Set the system maximum memory for OS to load while installation. If enabled the maximum available memory is 256MB RAM.
OS Install	This option is disable by default.
	Reason being some operating system will not complete install with more then 2GB of system memory.
System Logs
BIOS Events			Displays the system event log and allows you to:

Clear Log

Mark all Entries

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Cover

Dell™ OptiPlex™ 780 Service Manual—Desktop

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.

Removing the Cover

NOTE: You may need to install Adobe Flash Player from Adobe.com to view the following illustrations.

1.Follow the procedures in Before Working Inside Your Computer.

2.Pull back the cover release latch.

3. Tilt the cover outward from the top, and then remove the cover from the computer.

Replacing the Cover

To replace the cover, perform the steps above in reverse order.

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Primary Hard Drive

Dell™ OptiPlex™ 780 Service Manual—Desktop

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.

Removing the Primary Hard Drive

1.Follow the procedures in Before Working Inside Your Computer.

2.Remove the optical drive from the computer.

3.If present, remove the secondary hard drive from the computer.

4.Disconnect the hard-drive data cable.

5. Disconnect the hard-drive power cable.