HP Dx5150 - Compaq Business Desktop Troubleshooting Manual page 24

Troubleshooting Without Diagnostics
Solving General Problems (Continued)
Problem
Computer powered off
automatically and the
Power LED flashes Red
two times, once every
second, followed by a
two-second pause. The
Power LED will continue
flashing until the
problem is resolved.
2–8
Cause
Processor thermal
protection activated:
A fan may be blocked or
not turning.
OR
The heatsink is not
properly attached to the
processor.
www.hp.com
Solution
1. Ensure that the computer air vents
are not blocked and the
processor cooling fan is running.
Leave a 4-inch (10.2-cm)
clearance at the back of the
system unit and above the
monitor to permit the required
airflow.
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.
Troubleshooting Guide