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Following is a simple flowchart to help you solve common power supply–related problems:
- Check the AC power input. Make sure the cord is firmly seated in the wall socket and in the power supply socket. Try a different cord.
- Check the DC power connections. Make sure the motherboard and disk drive power connectors are firmly seated and making good contact. Check for loose screws.
- Check the DC power output. Use a digital multimeter to check for proper voltages. If it’s below spec, replace the power supply.
- Check the installed peripherals. Remove all boards and drives and retest the system. If it works, add items back in one at a time until the system fails again. The last item added before the failure returns is likely defective.
Many types of symptoms can indicate problems with the power supply. Because the power supply literally powers everything else in the system, everything from disk drive problems to memory problems to motherboard problems can often be traced back to the power supply as the root cause.