Dell OptiPlex GX300 User Manual page 61

The power indicator light-emitting diode (LED) and the hard-disk drive LED on the front of the computer emit diagnostic codes that can help you
troubleshoot a system problem. Table 3 lists the codes for the diagnostic LEDs, probable causes, and suggested corrective actions.
CAUTION: Before servicing any components inside your computer, see
Table 3. Diagnostic LED Codes
Power LED Code
Blinking yellow
Blinking yellow
Solid yellow
Solid green and a
beep code during
POST
Solid green power
indicator and no
beep code and no
video during POST
Solid green power
indicator and no
beep code but the
system locks up
during POST
Back to Contents Page
Hard-Disk Drive
LED Code Cause
Blank System power supply
failure.
Solid green Voltage regulator failure
on the system board.
N/A A device on the system
board may be faulty or
is incorrectly installed.
N/A A problem was
detected while the BIOS
was executing.
N/A The monitor or the
graphics card may be
faulty.
N/A An integrated system
board device may be
faulty.
"Safety First—For You and Your
Action
See "Getting Help" for instructions on
obtaining technical assistance.
See "Getting Help" for instructions on
obtaining technical assistance.
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.
See Table 2 for instructions on diagnosing
the beep code.
See "Troubleshooting the Monitor." If the
monitor is operating properly and is
correctly connected, see "Getting
instructions on obtaining technical
assistance.
See "Getting Help" for instructions on
obtaining technical assistance.
Computer."
Help" for