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Common Problem:
Power Supply - PC makes a loud whining or grinding noise when starting up or shutting down.

Solution:
All hard drives make some noise when they run, but abnormal whining or grinding noises coming from the back of your PC can be a symptom of a laboring power supply fan. If you hear this type of noise, it’s probably time to clean your power supply fan. To clean the fan, use a PC vacuum or a can of compressed air. Vacuum or blow dust off the edges of the fan blades and clean the area around the fan. Be sure to turn off your computer and unplug it while you clean the fan.

See Also:
Power Supplies
Protect Your PC From Heat & Overloads

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