Solving Power Problems - HP Elite 7000 - Microtower PC Maintenance And Service Manual

Solving Power Problems

Common causes and solutions for power problems are listed in the following table.
Table C-2
Power supply shuts down intermittently.
Cause
Voltage selector switch on rear of computer chassis (some
models) not switched to correct line voltage (115V or 230V).
Power supply will not turn on because of internal power supply
fault.
Computer powered off automatically.
Cause
Processor thermal protection activated:
A fan may be blocked or not turning.
OR
The heatsink is not properly attached to the processor.
Power failure (power supply is overloaded).
86 Appendix C Troubleshooting Without Diagnostics
Solving Power Problems
Solution
Select the proper AC voltage using the selector switch.
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.
1. Check that the voltage selector, located on the rear of the
power supply (some models), is set to the appropriate
voltage. Proper voltage setting depends on your region.
2. Open the hood and ensure the power supply cable is
seated into the connector on the system board.
3. Check if a device is causing the problem by removing ALL
attached devices (such as hard drives 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.
4. Replace the power supply.
5. Replace the system board.