System lights, Diagnostic lights – Dell OptiPlex SX280 User Manual
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System Lights
Your power button light may indicate a computer problem.
Diagnostic Lights
To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and "D" on the back panel. The lights can be amber 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.
the system for at least 10 seconds. Reattach the AC power cable to the power
supply. The light on the power supply should turn yellow. Reattach the DC
cable to the system. The light on the power supply should turn green.
Yellow
AC power is
present/no load
The power adapter is connected to an
electrical outlet but not to the
computer.
Ensure that the power adapter is firmly connected to the computer and the
retention latch is engaged.
Reseat the power adapter cable to the computer.
Green
AC power is
present/power to load
The power adapter is receiving power
from the electrical outlet and is
properly connected to the computer.
Check the power button light and see the "
" table.
Power Button Light
Problem Description
Suggested Resolution
Solid green
Power is on, and the computer is operating
normally.
No corrective action is required.
Blinking green
The computer is in the suspended state
(Microsoft® Windows® 2000 and 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
to see if the specific problem is
identified.
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.
Check the
to see if the specific problem is
identified.
If the computer does not boot,
contact Dell
for technical
assistance.
Solid green and a beep code during
POST
A problem was detected while the BIOS was
executing.
" for instructions on diagnosing the beep
problem is identified.
Solid green power light and no beep
code and no video during POST
The monitor may be faulty or attached incorrectly.
Check the
to see if the specific problem is
identified. See "
Video and Monitor Problems
."
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
to see if the specific problem is
identified. If the problem is not identified,
contact Dell
for
technical assistance.
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
Light
Pattern
Problem Description
Suggested Resolution
off
off
off
off
The computer is in a normal off
condition or a possible pre-BIOS
failure has occurred.
Plug the computer into a working electrical outlet and press the power button.
green
yellow
yellow
yellow
A possible BIOS failure has
occurred; the computer is in
recovery mode.
Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.
yellow
green
A possible processor failure has
occurred.
Reinstall the processor
and restart the computer.