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Troubleshooting Tools: Dell Precision T7400 User's Guide

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Troubleshooting Tools

Dell Precision™ T7400 User's Guide

  Diagnostic Lights

  Power Lights

  Beep Codes

  Error Messages

  Dell Diagnostics



Diagnostic Lights

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

To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front. The lights can be "off" or green. When the computer starts normally, the lights flash. If the computer malfunctions, the pattern of the lights and also that of the power button help to identify the problem. These lights also indicate sleep states.

Diagnostic Light Codes Before POST

Diagnostic Lights

Power Light

Problem Description

Suggested Resolution

off

The computer is in a normal off condition or in Windows Hibernation mode.

Press the power button to turn the computer on.

If the computer does not turn on, ensure that the front-panel power light is on. If the power light is off, ensure that the computer is connected to a working electrical outlet and then press the power button.

If the problem is still not resolved, contact Dell for technical assistance (see Contacting Dell).

blinking green

The computer is in a reduced power or "sleep" state.

Use one of the appropriate methods to "wake up" the computer. See Advanced Features.

If the problem is not resolved and you are trying to wake the computer with a USB mouse or keyboard, substitute the mouse or keyboard with a working PS/2 mouse or keyboard and then try to wake the computer.

green

None.

The system hardware appears to be operating normally. Any issues seen may be related to the operating system or software.

(blinking)

amber

The BIOS is not executing.

Ensure that the processor is seated correctly and restart the computer (see Processor).

If the problem is still not resolved, contact Dell for technical assistance (see Contacting Dell).

(blinking)

blinking amber

A possible power supply or power cable failure has occurred.

Perform the procedure in Power Problems.

If the problem is still not resolved, contact Dell for technical assistance (see Contacting Dell).

(blinking)

amber

A problem has been detected with either the memory risers or graphics riser.

Confirm that the memory risers and/or graphics riser are properly seated into the correct connector.

Confirm that the power cables are properly attached to the memory risers and graphics riser.

See Memory for further information.

If the problem is still not resolved, contact Dell for technical assistance (see Contacting Dell).

(blinking)

amber

A possible system board failure has occurred.

Contact Dell for technical assistance (see Contacting Dell).

(blinking)

amber

A possible system board failure has occurred.

Contact Dell for technical assistance (see Contacting Dell).

(blinking)

amber

A possible system board failure has occurred.

Contact Dell for technical assistance (see Contacting Dell).

(blinking)

amber

A possible system board failure has occurred.

Contact Dell for technical assistance (see Contacting Dell).

(blinking)

amber

A processor mismatch exists.

See Troubleshooting and then to Processor.

(blinking)

amber

Power supply cables are not properly connected.

Verify that both power supply cables are plugged in to the motherboard.

Diagnostic Light Codes During POST

The power light displays a solid green for diagnostic light codes during POST.

Light Pattern

Problem Description

Suggested Resolution

A possible processor failure has occurred.

Reinstall the processor (see Processor) and restart the computer.

A possible expansion card failure has occurred.

  1. Determine if a conflict exists by removing a card (not the graphics card) and then 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 Troubleshooting Software and Hardware Problems in the Microsoft® Windows® XP and Microsoft Windows Vista™ Operating Systems).
  4. If the problem persists, contact Dell for technical assistance (see Contacting Dell).

A possible graphics card failure has occurred.

  1. If the computer has a graphics card, remove the card, reinstall it, and then restart the computer (see Cards).
  2. If the problem still exists, install a graphics card that you know works and restart the computer.
  3. If the problem persists or the computer has integrated graphics, contact Dell for technical assistance (see Contacting Dell).

A possible floppy or hard drive failure has occurred.

Reseat all power and data cables and restart the computer.

A possible USB failure has occurred.

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

No memory modules are detected.

  1. Reseat the memory modules to ensure that your computer is successfully communicating with the memory (see Memory).
  2. Restart the computer.
  3. If the problem still exists, remove all the memory modules and install one memory module in memory module connector DIMM_1.
  4. Restart the computer.

A message appears stating that because your memory is not paired, the system will operate with reduced performance and reduced error-correction capability.

  1. Press <F1> to boot to the operating system.
  2. Run the Dell Diagnostics (see Dell Diagnostics).
  3. If the memory module passes, shut down the computer (see Turning Off Your Computer), remove the memory module, and then repeat the process with the remaining memory modules until a memory error occurs during start-up or diagnostic testing.

 

If the first memory module tested is defective, repeat the process with the remaining modules to ensure that the remaining modules are not defective.

  1. When the defective memory module is identified, contact Dell for a replacement (see Contacting Dell).

System board failure has occurred.

Contact Dell for technical assistance (see Contacting Dell).

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

  • 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).
  • Reinstall the memory modules and restart the computer.
  • If the problem persists, contact Dell (see Contacting Dell).

Routine system activity preceding video initialization.

Watch your monitor for on-screen messages.

A possible expansion card failure has occurred.

  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 Troubleshooting Software and Hardware Problems in the Microsoft® Windows® XP and Microsoft Windows Vista™ Operating Systems).
  4. If the problem persists, contact Dell (see Contacting Dell).

Routine system activity preceding video initialization.

Watch your monitor for on-screen messages.


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 (bi-color LED) located on the front of the computer illuminates and blinks or remains solid to indicate different states:

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

    • Reseat the power cable in the power connector on the back of the computer and the electrical outlet.

    • If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and that the power strip is turned on. Also, bypass power protection devices, power strips, and power extension cables to verify that the computer turns on properly.

    • Ensure that the electrical outlet is working by testing it with another device, such as a lamp.

  • If the power light is steady blue and the computer is not responding:

    • Ensure that the display is connected and powered on.

    • If the display is connected and powered on, see Beep Codes.

  • If the power light is blinking blue, 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 blue and the computer is not responding:

    • Ensure the display is connected and powered on.

    • If the display is connected and powered on, see Beep Codes.

  • If the power light is blinking amber, the computer is receiving electrical power, but a device might be malfunctioning or incorrectly installed.

    • Remove and then reinstall the memory modules (see Memory).

    • Remove and then reinstall any cards.

    • Remove and then reinstall the graphics card, if applicable.

  • If the power light is steady amber, there may be a power problem or an internal device malfunction.

    • Ensure that all power cables are securely connected to the system board (see System Board Components).

    • Ensure that the main power cable and front panel cable are securely connected to the system board (see System Board Components).


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.

If your computer beeps during start-up:

  1. Write down the beep code on the Diagnostics Checklist.

  2. Run the Dell Diagnostics to identify a more serious cause (see Dell Diagnostics).

  3. Contact Dell for technical assistance (see Contacting Dell).

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

1-3-2

Memory problem

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


Error Messages

Fill out the Diagnostics Checklist as you complete these checks.

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

If the message is not listed, see the documentation for the operating system or the program that was running when the message appeared.

A filename cannot contain any of the following characters: \ / : * ? " < > |  —   Do not use these characters in filenames.

A required .DLL file was not found  —  The program that you are trying to open is missing an essential file. To remove and then reinstall the program:

  1. Click the Start button, click Control Panel, and then click Add or Remove Programs.
  2. Select the program you want to remove.
  3. Click the Change or Remove Program icon.
  4. See the program documentation for installation instructions.

Alert! Air Temperature Sensor Not Detected. — Ensure that all cables are securely fastened to the I/O panel and to the system board and reboot your computer. If this does not resolve the problem, contact Dell. (See "Contacting Dell" on page 259.)

Alert! CPU Installed in Incorrect Socket  —

Alert! System thermal solution compromised. Replace system cover and reboot — Ensure that the computer cover is correctly installed, then restart your computer.

NOTE: Single processor configurations must use CPU_0.

Alert! Previous attempts at booting this system have failed at checkpoint [nnnn]. For help in resolving this problem, please note this checkpoint and contact Dell Technical Support  — Contact Dell and report the checkpoint code (nnnn) to the support technician. (See Contacting Dell.)

Alert! Memory Fan Failure  —

Alert! Hard Drive Fan Failure  —

Alert! Front Fan Failure  —

Alert! Chipset heatsink not detected. —

Alert! Card Cage Fan Failure  —

Alert! Power Supply Fan Failure  —

Alert! Previous Fan Failures  —

Alert! Previous Thermal Failure  —

Alert! Previous Shutdown Due to Thermal Event  —  Ensure that nothing is blocking the airflow vents and that all the fans are properly installed and operating correctly. Also, ensure that the processor heat-sink assembly is properly installed.

Alert! Previous Reboot Was Due to Voltage Regulator Failure  —  Contact Dell for assistance. See Contacting Dell.

Alert! System Battery Voltage is Low  — Replace the battery. See Replacing the Battery.

Alert! Memory Configuration Mismatch. Please enter Setup for Memory Information details. —

Alert! Memory Risers must be installed as a set of four  —

Alert! Uncorrectable Memory Error Previously Detected in DIMM_X/Y  —

 

Alert! Operating in single channel debug mode. Please populate memory in matched sets for normal operation. —

Alert! Memory Built-in Self Test fails in DIMM_X/Y  — See Memory Problems.

Alert! Invalid Memory installed. DIMMs must have Full DIMM Heat Spreaders  — Ensure that you are using or have installed the full-length heat spreaders correctly.

Attachment failed to respond  —  See Drive Problems.

Bad command or file name  —  Ensure that you spelled the command correctly, put spaces in the proper place, and used the correct path name.

Bad error-correction code (ECC) on disk read  —  See Drive Problems.

Controller has failed  —  See Drive Problems.

Data error  —  See Drive Problems.

Decreasing available memory  —  See Lockups and Software Problems.

Diskette drive 0 seek failure  —  See Drive Problems.

Diskette read failure  —  See Drive Problems.

Diskette subsystem reset failed  —  Run the Dell Diagnostics. See Dell Diagnostics.

Diskette write protected  —  Slide the write-protect notch to the open position.

Drive not ready  —  Put a floppy disk in the drive.

Gate A20 failure  —  See Lockups and Software Problems.

Hard-disk configuration error  —


Hard-disk controller failure  —


Hard-disk drive failure  —


Hard-disk drive failure  —

See Drive Problems.

Insert bootable media   — Insert a bootable floppy disk, CD, or other bootable media.

Invalid configuration information - please run SETUP program  —  Enter system setup (see System Setup) and correct the computer configuration information.

Keyboard failure  — See Keyboard Problems

Memory address line failure at address, read value expecting value   See Memory Problems.

Memory allocation error  —  

  1. Turn off the computer, wait 30 seconds, and then restart the computer.
  2. Try to run the program again.
  3. If the error message appears again, see the software documentation for additional troubleshooting suggestions.

Memory data line failure at address, read value expecting value 

Memory double word logic failure at address, read value expecting value 

Memory odd/even logic failure at address, read value expecting value 

Memory write/read failure at address, read value expecting value 

Memory size in CMOS invalid  —

See Memory Problems.

No boot device available  —  

  • If the floppy drive is your boot device, ensure that bootable media is in the drive.
  • If the hard drive is your boot device, ensure that the cables are connected and that the drive is installed properly and partitioned as a boot device.
  • Enter system setup (see System Setup) and ensure that the boot sequence information is correct.

No boot sector on hard-disk drive  —  Enter system setup (see System Setup) and ensure that the computer configuration information for the hard drive is correct.

If the message continues to appear after you ensure that the information in system setup is correct, see your operating system documentation for reinstallation information.

No timer tick interrupt  —   Run the Dell Diagnostics. See Dell Diagnostics.

Non-system disk or disk error  —  Replace the floppy disk with one that has a bootable operating system or remove the floppy disk from drive A and restart the computer.

Not a boot diskette  —  Insert bootable media and restart your computer.

Not enough memory or resources. Close some programs and try again  —  Close all windows and open the program that you want to use. In some cases, you might have to restart your computer to restore computer resources. If so, run the program that you want to use first.

Operating system not found  —  Contact Dell (see Contacting Dell).

Please Connect USB Keyboard/Mouse to USB Ports on the Back of the Computer  —  Turn your computer off, connect the USB keyboard and/or mouse to the USB connectors on the back of the computer, and then restart your computer.

Plug and Play Configuration Error  —

  1. Turn your computer off, unplug it from the electrical outlet, and then remove all but one of the cards.
  2. Plug in your computer and reboot it.
  3. If the message reappears, the installed card might be malfunctioning. If the message does not reappear, turn off the computer and reinsert one of the other cards.
  4. Repeat this process until you identify which card is malfunctioning.

Read fault  —

Requested sector not found  —

Reset failed  —

See Drive Problems.

Sector not found  —  

  • Run the Windows error-checking utility to check the file structure on the floppy disk or hard drive. See Windows Help for instructions.
  • If a large number of sectors are defective, back up the data (if possible), and then reformat the floppy disk or hard drive.

Seek error  —  See Drive Problems.

Shutdown failure  —  Run the Dell Diagnostics. See Dell Diagnostics.

Time-of-day clock stopped  —  

Time-of-day not set —  

Enter system setup (see System Setup) and correct the date or time. If the problem persists, replace the battery (see Battery).

Timer chip counter 2 failed  —  Run the Dell Diagnostics. See Dell Diagnostics.

Unexpected interrupt in protected mode  —  Run the Dell Diagnostics. See Dell Diagnostics.

WARNING: Dell's Disk Monitoring System has detected that drive [0/1] on the IDE controller is operating outside of normal specifications. It is advisable to immediately back up your data and replace your hard drive by calling your support desk or Dell  —

 If no replacement drive is immediately available and the drive is not the only bootable drive, enter system setup and change the appropriate drive setting to None (see System Setup). Then remove the drive from the computer.

Write fault  —

Write fault on selected drive  —

See Drive Problems.

<drive letter>:\ is not accessible. The device is not ready  —  The floppy drive cannot read the disk. Insert a floppy disk into the drive and try again.


Dell Diagnostics

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

When to Use the Dell Diagnostics

If you experience a problem with your computer, perform the checks in Lockups and Software Problems and run the Dell Diagnostics before you contact Dell for technical assistance.

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

NOTICE: The Dell Diagnostics works only on Dell™ computers.
NOTE: The Drivers and Utilities media is optional and may not ship with your computer.

Enter system setup (see 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. See Starting the Dell Diagnostics From the 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 (see Turning Off 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 (see Dell Diagnostics Main Menu), select the test that you want to run.

Starting the Dell Diagnostics From the Drivers and Utilities Media

  1. Insert the Drivers and Utilities media.

  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 start-up, 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.

If you cannot resolve the error condition, contact Dell (see Contacting Dell).

NOTE: The Service Tag for your computer is located at the top of each test screen. If you contact Dell, technical support will ask for your Service Tag.
  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 media, 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.

Diagnostics Checklist

Name:

Date:

Address:

Phone number:

Service Tag (bar code on the back of the computer):

Express Service Code:

Return Material Authorization Number (if provided by Dell support technician):

Operating system and version:

Devices:

Expansion cards:

Are you connected to a network? Yes No

Network, version, and network adapter:

Programs and versions:

See your operating system documentation to determine the contents of the system's start-up files. If the computer is connected to a printer, print each file. Otherwise, record the contents of each file before calling Dell.

Error message, beep code, or diagnostic code:

Description of problem and troubleshooting procedures you performed:


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