Solving Power Problems - HP Compaq 6005 Pro Maintenance And Service Manual

Solving Power Problems

Common causes and solutions for power problems are listed in the following table.
Power supply shuts down intermittently.
Cause
Power supply will not turn on because of internal power
supply fault.
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. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Thermal protection activated:
Air flow is restricted, a fan may not be functioning, or the
heatsink is not properly attached.
100 Appendix E Troubleshooting Without Diagnostics
Solution
Contact an authorized service provider to replace the power
supply.
Solution
1. Clean the air vents on the front, back, or any other
vented side of the computer.
2. Ensure that there is a 10.2 cm (4 in) clearance on all
vented sides of the computer to permit the required
airflow.
3. Ensure that computers are not stacked on top of each
other or so near each other that they are subject to
each other's re-circulated or preheated air.
4. If the computer is within an enclosure, ensure that there
is proper intake and exhaust ventilation for the
enclosure.
5. If a message appears on the screen indicating that a
fan is not working, replace the fan.
6. Ensure that the heat sink is properly attached.