Troubleshooting Guide

A–14 www.hp.com Troubleshooting Guide
POST Error Messages
Red Power LED
flashes two times,
once every second,
followed by a two
second pause.
2 Processor thermal
protection
activated:
A fan may be
blocked or not
turning.
OR
The heatsink/fan
assembly is not
properly attached
to the processor.
1. Ensure that the computer air vents
are not blocked and the processor
cooling fan is running.
2. Reboot the system and observe if
there are any POST messages
stating that one or more of the fans
are not detected. If a fan is not
detected during POST, unplug the
unit, open the chassis and ensure
that the all the fans are plugged in
correctly.
3. If fan is plugged in and seated
properly, and the POST message
still appears, then replace the
processor fan.
4. Reseat processor heatsink and
verify that the fan assembly is
properly attached. See the
appropriate Service Reference
Guide for instructions on how to
reinstall the heatsink. Correct
heatsink installation is critical to
proper system operation.
5. Contact an authorized reseller or
service provider.
Red Power LED
flashes three times,
once every second,
followed by a two
second pause.
3 Processor not
installed (not an
indicator of bad
processor).
1. Check to see that the processor is
present.
2. Reseat the processor.
Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity Beeps Possible Cause Recommended Action