HP Dx5150 Troubleshooting Guide - Page 24

Problem, Cause, Solution, Power LED flashes Red

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Troubleshooting Without Diagnostics Solving General Problems (Continued) Problem Cause 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. Processor thermal protection activated: A fan may be blocked or not turning. OR The heatsink is not properly attached to the processor. 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. 2-8 www.hp.com Troubleshooting Guide

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www.hp.com
Troubleshooting Guide
Troubleshooting Without Diagnostics
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.
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.
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.
Solving General Problems
(Continued)
Problem
Cause
Solution