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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.

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

  2. 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.
  1. When the boot device list appears, highlight Onboard or USB CD-ROM Drive and press <Enter>.

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

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

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

  5. 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 Test

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

Extended Test

Performs a thorough check of devices. This test typically takes 1 hour or more and requires you to answer questions periodically.

Custom Test

Tests a specific device. You can customize the tests you want to run.

Symptom Tree

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

  1. 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.
  1. 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.

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

  2. 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 State Description
Off
Picture of the diagnostic Power LED in the Off state.
Power is off, light is blank.
Blinking Amber
Picture of the diagnostic Power LED in the Blinking Amber state.
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.
Solid Amber
Picture of the diagnostic Power LED in the Solid Amber state.
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.
Blinking Green
Picture of the diagnostic Power LED in the Blinking Green state.
System is in a low power state, either S1 or S3. Look at the diagnostic lights to determine which state the system is in.
Solid Green
Picture of the diagnostic Power LED in the Solid Green state.
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

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 computer successfully boots to the operating system.

  • Plug the computer into a working electrical outlet.
  • If the problem persists, contact Dell.

A possible processor failure has occurred.

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

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

  • 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.

  • Reseat any installed graphics cards.
  • If available, install a working graphics card into your computer.
  • If the problem persists, contact Dell .

A possible floppy drive or hard drive failure has occurred.

Reseat all power and data cables.

A possible USB failure has occurred.

Reinstall all USB devices and check all cable connections.

No memory modules are detected.

  • 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.

Memory modules are detected, but a memory configuration or compatibility error has occurred.

  • Ensure that no special requirements for memory module/connector placement exist.
  • Ensure that the memory you are using is supported by your computer (see the "Specifications" section for your computer).
  • If the problem persists, contact Dell.

A possible expansion card failure has occurred.

  • Determine if a conflict exists by removing an expansion card (not a graphics card) and restarting the computer.
  • 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 occurred.

  • Ensure that all hard drive and optical drive cables are properly 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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