Dell OptiPlex XE (Early 2010) - Manual (Page 13)

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.
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
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.
l Plug the computer into a working electrical outlet.
l If the problem persists, contact Dell.
A possible processor failure has
occurred. l Reseat the processor (see Processor information for your computer).
l If the problem persists, contact Dell.
Memory modules are detected, but
a memory failure has occurred. l 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.
l If available, install working memory of the same type into your computer.
l If the problem persists, contact Dell.
A possible graphics card failure has
occurred. l Reseat any installed graphics cards.
l If available, install a working graphics card into your computer.
l 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. l 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.
l If available, install working memory of the same type into your computer.
l If the problem persists, contact Dell.
Memory modules are detected, but
a memory configuration or
compatibility error has occurred. l Ensure that no special requirements for memory module/connector placement exist.
l Ensure that the memory you are using is supported by your computer (see the Specifications
section for your computer).
l If the problem persists, contact Dell.
A possible expansion card failure
has occurred. l Determine if a conflict exists by removing an expansion card (not a graphics card) and
restarting the computer.
l If the problem persists, reinstall the card you removed, then remove a different card and
restart the computer.
l Repeat this process for each expansion card installed. If the computer starts normally,
troubleshoot the last card removed from the computer for resource conflicts.
l If the problem persists, contact Dell.
Another failure has occurred. l Ensure that all hard drive and optical drive cables are properly connected to the system
board .
l 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.