Basic Troubleshooting
Interpreting the Diagnostic Lights
Compaq computers feature diagnostic lights or LEDs (light emitting
diodes) to indicate various computer states or errors. The following
tables describe the diagnostic light indications. Refer to the
Troubleshooting Guide on the Compaq Reference Library CD for
more information.
Computer LEDs
LED Color LED Activity State/Message
Power Green On (S0) Computer on
Power Green 1 flash every 1 second (S1) Normal suspend mode
Power Green 1 flash every 2 seconds (S3) Suspend to RAM
(ifapplicable)
Power Green 1 flash every 4 seconds (S4) Suspend to disk
(ifapplicable)
Power Clear Off (S5) Computer off
Power Red or
Yellow*
4 flashes every 1 second,
or 2 flashes 1 second
apart followed by a 2
second pause
CPU thermal shutdown
Power Red or
Yellow
On CPU not installed or
incorrect processor
installed
Power Red or
Yellow
1 flash every second ROM error
Power Red or
Yellow
1 flash every 2 seconds Power supply overload
Network Controller Green On Network link (Evo Workstation
W8000 only)
Network Controller Green Flashing Network activity (Evo
Workstation W8000 only)
Hard Drive Green Flashing Hard drive activity
*Power LED may not flash on some models.
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