Troubleshooting Guide

A–16 www.hp.com Troubleshooting Guide
POST Error Messages
Red Power LED
flashes four times,
once every second,
followed by a two
second pause.
4 Power failure
(power supply is
overloaded).
1. Open the hood and ensure the
4-wire power supply cable is
seated into the connector on the
system board.
2. Check if a device is causing the
problem by removing ALL attached
devices (such as hard, diskette, or
optical drives, and expansion
cards). Power on the system. If the
system enters the POST, then power
off and replace one device at a
time and repeat this procedure until
failure occurs. Replace the device
that is causing the failure. Continue
adding devices one at a time to
ensure all devices are functioning
properly.
3. Replace the power supply.
4. Replace the system board.
Red Power LED
flashes five times,
once every second,
followed by a two
second pause.
5Pre-video memory
error.
1. Reseat DIMMs. Power on the
system.
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.
Red Power LED
flashes six times,
once every second,
followed by a two
second pause.
6 Pre-video graphics
error.
For systems with a graphics card:
1. Reseat the graphics card. Power on
the system.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics,
replace the system board.
Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity Beeps Possible Cause Recommended Action