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There's a squealing or whining sound coming from the power supply when I turn it on
Explanation: The PC is making a squealing or whining sound, coming from the back of the power supply unit. The sound may be louder when the PC is first started up, and then diminish, or it may get worse as the PC is left on for a period of time.
Diagnosis: Usually, the cause of this problem is the fan on the back of the power supply. It will tend to accumulate dirt over time, and cheaper ones will fail readily. If the fan is making noise now, it will probably fail soon. This usually takes years, but with cheaper power supplies that can be a surprisingly small number of years. Rarely, the problem can be with the internals of the power supply itself.