Diagnostic Lights - Dell Optiflex 740 User Manual

Blinking green
Blinks green several times and then
turns off
Solid yellow
Blinking yellow
Solid green and a beep code during
POST
Solid green power light and no beep
code and no video during POST
Solid green power light and no beep
code but the computer locks up
during POST
Diagnostic Lights
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located 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 panel. The lights can be off or green. When the
computer starts normally, the patterns or codes on the lights change as the boot process completes. If the POST portion of system boot completes
successfully, all four lights display solid green. If the computer malfunctions during the POST process, the pattern displayed on the LEDs may help identify
where in the process the computer halted.
NOTE: The orientation of the diagnostic lights may vary depending on the system type. The diagnostic lights can appear either vertical or horizontal.
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 BIOS failure has occurred; the
computer is in the recovery mode.
A possible processor failure has occurred.
Memory modules are detected, but a
memory failure has occurred.
A possible graphics card failure has
occurred.
A possible floppy or hard drive failure has
occurred.
A possible USB failure has occurred.
No memory modules are detected.
The computer is in a power-saving mode (Microsoft®
Windows® XP).
A configuration error exists.
The Dell Diagnostics is running a test, or a device on the
system board may be faulty or incorrectly installed.
A power supply or system board failure has occurred.
A problem was detected while the BIOS was executing.
The monitor or the graphics card may be faulty or
incorrectly installed.
An integrated system board device may be faulty.
Suggested Resolution
Plug the computer into a working electrical outlet and press the power button.
Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.
Reinstall the processor and restart the computer.
If you have one memory module installed, reinstall it and restart the computer (see
l
Memory
If you have two or more memory modules installed, remove the modules, reinstall one
l
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.
l
If the problem persists,
l
If the computer has a graphics card, remove the card, reinstall it, and then restart the
l
computer.
If the problem still exists, install a graphics card that you know works and restart the
l
computer.
If the problem persists or the computer has integrated graphics,
l
Reseat all power and data cables and restart the computer.
Reinstall all USB devices, check cable connections, and then restart the computer.
If you have one memory module installed, reinstall it and restart the computer (see
l
Memory
If you have two or more memory modules installed, remove the modules, reinstall one
l
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.
l
If the problem persists,
l
Press the power button, move the mouse, or press a key
on the keyboard to wake the computer.
Check the

diagnostic lights

identified.
If the Dell Diagnostics is running, allow the testing to
complete.
If the computer does not boot,
assistance.
See Power Problems.
See Beep Codes
code. Also, check the
problem is identified.
Check the diagnostic lights
identified (see
Check the diagnostic lights
identified. If the problem is not identified,
technical assistance.
for instructions on how to remove and install memory modules).
contact Dell.
for instructions on how to remove and install memory modules).
contact Dell.
to see if the specific problem is
contact Dell for technical
for instructions on diagnosing the beep
diagnostic lights to see if the specific
to see if the specific problem is
Video and Monitor Problems).
to see if the specific problem is
contact Dell
contact Dell.
for