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The fan on my power supply has stopped blowing, is turning very slowly and not blowing hard, is making noises, or is only working intermittently
Explanation: The fan on the back of the power supply is malfunctioning, either permanently or intermittently.
Diagnosis: The most common cause of problems with the power supply fan is dirt that accumulates inside the fan. Sometimes cleaning the fan will fix the problem, but often it will not. The fan may also just wear out after a period of time. A fan that is working intermittently will eventually fail, usually within a few weeks.