Dell OptiPlex 745 desktop system

A failure has occurred.

This pattern also displays when you enter system setup (see Entering System Setup) <ADMIN NOTE: Broken link has been removed from this post by Dell> and may not indicate a problem.

• Ensure that the cables are properly connected to the system board from the hard drive, CD drive, and DVD drive.
• Check the computer message that appears on your monitor screen.
• If the problem persists, contact Dell (see Contacting Dell). 

Solid green

Power is on, and the computer is operating normally. On the desktop computer, a solid green light indicates a network connection.

No corrective action is required.

Blinking green

The computer is in a power-saving mode (Microsoft® Windows® XP).

Press the power button, move the mouse, or press a key on the keyboard to wake the computer.

Blinks green several times and then turns off

A configuration error exists.

Check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

Solid yellow

The Dell Diagnostics is running a test, or a device on the system board may be faulty or incorrectly installed.

If the Dell Diagnostics is running, allow the testing to complete.

If the computer does not boot, contact Dell for technical assistance (see Contacting Dell). 

Blinking yellow

A power supply or system board failure has occurred.

See Power Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Solid green and a beep code during POST

A problem was detected while the BIOS was executing.

See Beep Codesfor instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

Solid green power light and no beep code and no video during POST

The monitor or the graphics card may be faulty or incorrectly installed.

Check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

See Video and Monitor Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Solid green power light and no beep code but the computer locks up during POST

An integrated system board device may be faulty.

Check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

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

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 and press the power button.

A possible BIOS failure has occurred; the computer is in the recovery mode.

Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.

A possible processor failure has occurred.

Reinstall the processor and restart the computer.

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

• If you have one memory module installed, reinstall it and restart the computer. (see Memory for instructions on how to remove and install memory modules.)
• If you have two or more memory modules installed, remove the modules, reinstall one module, and then restart the computer. If 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.
• If the problem persists, contact Dell (see Contacting Dell). 

A possible graphics card failure has occurred.

• If the computer has a graphics card, remove the card, 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 or the computer has integrated graphics, contact Dell (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.

• If you have one memory module installed, reinstall it and restart the computer. (see Memory for instructions on how to remove and install memory modules.)
• If you have two or more memory modules installed, remove the modules, reinstall one module, and then restart the computer. If 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.
• If the problem persists, contact Dell (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).
• If the problem persists, contact Dell (see Contacting Dell). 

A failure has occurred.

This pattern also displays when you enter system setup (see Entering System Setup) <ADMIN NOTE: Broken link has been removed from this post by Dell> and may not indicate a problem.

• Ensure that the cables are properly connected to the system board from the hard drive, CD drive, and DVD drive.
• Check the computer message that appears on your monitor screen.
• If the problem persists, contact Dell (see Contacting Dell). 

After POST is complete, all four diagnostic lights turn green briefly before turning off to indicate normal operating condition.

None.

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

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! 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 (see Contacting Dell)  and report the checkpoint code ( nnnn) to the support technician.

Alert! Air temperature sensor not detected  —  For any computer type except the ultra small form-factor computer, 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 or if you have an ultra small form-factor computer, contact Dell (see Contacting Dell). 

Attachment failed to respond  —  See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

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

Bad error-correction code (ECC) on disk read  —  See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Controller has failed  —  See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Data error  — See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Decreasing available memory  —

 See Lockups and Software Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Diskette drive 0 seek failure  — See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Diskette read failure  —

See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Diskette subsystem reset failed  —  Run the Dell Diagnostics (see Dell Diagnostics).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

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

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

Gate A20 failure  —

 See Lockups and Software Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Hard-disk configuration error  —

 
Hard-disk controller failure  —

 
Hard-disk drive failure  —

 
Hard-disk drive failure  —

See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

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

Invalid configuration information - please run SETUP program  —  Enter system setup and correct the computer configuration information (see Entering System Setup). <ADMIN NOTE: Broken link has been removed from this post by Dell>

Keyboard failure  — See Keyboard Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Memory address line failure at address, read value expecting value  —  See Lockups and Software Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

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 Lockups and Software Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

No boot device available  —  

• If the floppy drive is your boot device, ensure that a bootable floppy disk 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 and ensure that the boot sequence information is correct (see Entering System Setup). <ADMIN NOTE: Broken link has been removed from this post by Dell>

No boot sector on hard-disk drive  — Enter system setup and ensure that the computer configuration information for the hard drive is correct (see Entering System Setup). <ADMIN NOTE: Broken link has been removed from this post by Dell>

No timer tick interrupt  —   Run the Dell Diagnostics (see Dell Diagnostics).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

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 a bootable floppy disk 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). 

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. <ADMIN NOTE: Broken link has been removed from this post by Dell>

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. <ADMIN NOTE: Broken link has been removed from this post by Dell>

Shutdown failure  —   Run the Dell Diagnostics (see Dell Diagnostics).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

Time-of-day clock stopped  —

 
Time-of-day not set-please run the System Setup program  —  

Timer chip counter 2 failed  —  Run the Dell Diagnostics (see Dell Diagnostics).

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

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 [primary/secondary] EIDE 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 (see Entering System Setup) <ADMIN NOTE: Broken link has been removed from this post by Dell> and change the appropriate drive setting to None. Then remove the drive from the computer.

Write fault  —  

Write fault on selected drive  —

See Drive Problems. <ADMIN NOTE: Broken link has been removed from this post by Dell>

<drive letter>:\ is not accessible. The device is not ready  —  The selected drive cannot read its medium. Depending on its medium type, insert a floppy, CD, or Zip disk into the drive and try again.