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I own a CM V750 Fully Modular power supply bought it Q2, 2018. 

 

The PSU randomly starts giving a buzzing noise. I first noticed it a few days ago. The PSU was plugged into the wall socket which was powered on, however, the switch on the PSU was turned off.

 

The buzzing noise stopped when the wall socket switch was turned off and restarted when the wall socket switch was turned on. Turning on or off the PSU switch did not make any difference.

 

This only occurs randomly. 

 

Any idea what the issue could be? The PC powers up and works fine.

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