Solving Power Problems - HP Rp5700 - Point of Sale System Reference Manual

Solving Power Problems

Common causes and solutions for power problems are listed in the following table.
Table D-2
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
Processor thermal protection activated:
A fan may be blocked or not turning.
OR
The heatsink is not properly attached to the processor.
Power LED flashes Red four times, once every second, followed by a two second pause, and the computer beeps four
times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Power failure (power supply is overloaded).
146 Appendix D Troubleshooting Without Diagnostics
Solving Power Problems
Solution
Contact an authorized service provider to replace the power
supply.
Solution
1. Ensure that the computer air vents are not blocked and
the processor cooling fan is running.
2. Open hood, press power button, and see if the processor
fan spins. If the processor fan is not spinning, make sure
the fan's cable is plugged onto the system board header.
3. If fan is plugged in, but is not spinning, then replace the
heatsink/fan assembly.
4. Contact an authorized reseller or service provider.
Solution
1. Open the hood and ensure the 4- or 6-wire power supply
cable is seated into the connector on the system board.
2. Check if a device is causing the problem by removing ALL
attached devices (such as hard, diskette, or optical
drives, and expansion cards). Power on the system. If the
system enters the POST, then power off and replace one
device at a time and repeat this procedure until failure
occurs. Replace the device that is causing the failure.
Continue adding devices one at a time to ensure all
devices are functioning properly.
3. Replace the power supply.
4. Replace the system board.
ENWW