Interpreting The Diagnostic Lights - Compaq Evo Series Getting Started

Interpreting the Diagnostic Lights

Computer LEDs
LED
Power
Power
Power
Power
Power
Power
Power
Power
Power
Network Controller
Network Controller
Hard Drive
*Power LED may not flash on some models.
Getting Started
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.
Color LED Activity
Green On
Green 1 flash every 1 second
Green 1 flash every 2 seconds
Green 1 flash every 4 seconds
Clear Off
Red or 4 flashes every 1 second,
Yellow* or 2 flashes 1 second
apart followed by a 2
second pause
Red or On
Yellow
Red or 1 flash every second
Yellow
Red or 1 flash every 2 seconds
Yellow
Green On
Green Flashing
Green Flashing
Basic Troubleshooting
State/Message
(S0) Computer on
(S1) Normal suspend mode
(S3) Suspend to RAM
(ifapplicable)
(S4) Suspend to disk
(ifapplicable)
(S5) Computer off
CPU thermal shutdown
CPU not installed or
incorrect processor
installed
ROM error
Power supply overload
Network link (Evo Workstation
W8000 only)
Network activity (Evo
Workstation W8000 only)
Hard drive activity
2-3