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

4 flashes every 1 second,

CPU thermal shutdown

 

Yellow*

or 2 flashes 1 second

 

 

 

apart followed by a 2

 

 

 

second pause

 

 

 

 

 

Power

Red or

On

CPU not installed or

 

Yellow

 

incorrect processor

 

 

 

installed

 

 

 

 

Power

Red or

1 flash every second

ROM error

 

Yellow

 

 

 

 

 

 

Power

Red or

1 flash every 2 seconds

Power supply overload

 

Yellow

 

 

 

 

 

 

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.

 

 

 

 

 

Getting Started

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