Troubleshooting Guide

Troubleshooting Guide www.hp.com 2–11
Troubleshooting Without Diagnostics
Computer powered off
automatically and the
Power LED flashes Red two
times, once every second,
followed by a two second
pause, and the computer
beeps two times.
Processor thermal
protection activated:
A fan may be blocked
or not turning.
OR
The heatsink 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.
Solving Power Supply Problems (Continued)
Problem Cause Solution