4 Diagnostics and Troubleshooting

POST Diagnostic Front Panel LEDs and Audible Codes

This section covers the front panel LED codes as well as the audible codes that may occur before or during POST that do not necessarily have an error code or text message associated with them.

✎If you see flashing LEDs on a PS/2 keyboard look for flashing LEDs on the front panel of the computer and refer to the following table to determine the front panel LED codes.

✎Recommended actions in the following table are listed in the order in which they should be performed.

Diagnostic Front Panel LEDs and Audible Codes

Possible Cause

Beeps &

Activity

Recommended Action

LED blink

Computer on.

None

Green Power LED On.

None

Green Power LED flashes five

times, once every second,

Pre-video memory5 followedpause. by a two second Beeps stop after fifth iteration but LEDs continue until problem is solved.

CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module.

1.Reseat DIMMs.

2.Replace DIMMs one at a time to isolate the faulty module.

3.Replace third-Party memory with HP memory. 4.Replace the system board

Service Reference Guide

www.hp.com

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