HP dx2100 HP Compaq dx2100 MT Business PC Service Reference Guide (1st Edition - Page 86
Solving Power Supply Problems, Problem, Cause, Solution
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Troubleshooting Without Diagnostics Solving Power Supply Problems Solving Power Supply Problems Problem Cause Power supply shuts down intermittently. Voltage selector switch on rear of computer chassis not switched to correct line voltage. Power supply fault. Computer powered off automatically and the Power LED glows for 4 seconds followed by a one second pause. Processor thermal protection activated: A fan may be blocked or not turning. OR The heatsink/fan assembly is not properly attached to the processor. Solution Select the proper AC voltage. Replace the power supply. 1. Ensure that the computer air vents are not blocked and the cooling fan is running. 2. Open hood, press the 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. Ensure the fan is fully/properly seated or installed. 3. Replace the processor fan. 4. Reseat processor heatsink and verify that the fan assembly is properly attached. D-4 404569-001 Service Reference Guide, dx2100 MT