Troubleshooting LEDs and Beeps

PCA Diagnostic Lights

Light

Beeps

Meaning and Required Action

Cap Lock

1 long 2 short

Flashes when a graphics controller is not present or in incorrectly initialized. This feature is supported by the 12/17/97 or later system ROM.

Num Lock

1 short 2 long

Flashes when system memory is not present or is incompatible. This feature is supported by the 12/17/97 or later system ROM.

Scroll Lock

2 long 1 short

Flashes when there is a system board hardware failure. This feature is supported by the 12/17/97 or later system ROM.

"Incompatible DIMM" message displayed at POST

Detect incompatible DIMMs, those that do not meet Compaq specifications. Not beeps or LED flashes.

Power and Hard Drive Activity

 

Flashes together when the riser board is not fully seated or is not present on the system board. This feature is supported by the system board with Assy# 008093-101, 008096-101 and 008219-101.

NOTE: LEDs cannot be blinked on USB keyboards. The beeps were added for this reason.