Dell OptiPlex GX150 - Manual (Page 87)

Back Panel LEDs
When you turn on your system, it performs a power-on self-test (POST), which is a series of self-diagnostic checks. A successful POST ends with
a single beep that signifies the start of normal operation. If the system fails to emit the single beep or appears to stop responding during POST, a
series of LEDs located at the rear of the computer can help you understand which POST test failed or why the system stopped responding. These
LEDs indicate problems encountered during POST only, not during normal operation.
The LED patterns described in Table 4 can help you determine what to do to resolve the problem. If a problem resolution requires you to open the
computer chassis, refer to "
Finding Solutions " for procedures you need to complete prior to performing the suggested resolution. If the problem
persists after you perform the suggested problem resolution(s), contact Dell Technical Assistance for further help.
Table 4 lists the codes for the back panel diagnostic LEDs, gives their probable causes, and offers suggested corrective actions. The LED
patterns are shown as they appear on the back of the desktop chassis (vertical position).
Table 4. Back Panel Diagnostic LED Codes
Blinking yellow The system power supply may have failed.
See " Getting Help " for instructions on obtaining
technical assistance.
Solid yellow
A device on the system board may be faulty or
is incorrectly installed.
Be sure that each microprocessor is properly
seated,
remove all expansion cards , and then
reboot. If the system does not boot, see
"
Getting Help " for instructions on obtaining
technical assistance.
Solid green and a beep code during POST
A problem was detected while the BIOS was
executing. See Table 2 for instructions on diagnosing the
beep code.
Solid green power indicator with no beep
code and no video during POST The monitor or the graphics card may be
faulty.
See " Video and Monitor Problems ." If the
monitor is operating properly and is correctly
connected, see "
Getting Help " for instructions
on obtaining technical assistance.
Solid green power indicator and no beep
code but the system locks up during POST An integrated system board device may be
faulty. See " Getting Help " for instructions on obtaining
technical assistance.
CAUTION: Before servicing any components inside your computer, see " Safety Information ."
LED
pattern
Problem Description Suggested Resolution
off
off
off
off Normal off condition or possible pre-
BIOS failure Verify that the system is plugged into a working outlet
and that you have pressed the power button.
green
yellow
yellow
yellow Possible BIOS failure; the system is in
the recovery mode Run the BIOS Recovery Utility, wait for recovery
completion, and restart the system to retest.
yellow
green
yellow
yellow Possible processor failure Reseat the processor(s) and the terminator card (if
present), and restart the system to retest.
green
green
yellow
yellow Possible memory failure Reseat all DIMMs and restart the system to retest.
yellow
yellow
green
yellow Possible expansion card failure Remove each expansion card individually, and restart
the system to retest.
Reinstall the expansion card(s) one at a time, and
restart the system to retest.
Move each expansion card one at a time to another
PCI slot, and restart the system to retest.