power supply buzzing?

Fixing a noisy PC power-supply

it could be coming from a motherboard onboard circuit or transistor or any other device. if the sound persists after upgrading the PSU, than it is not the PSU making the sound. to absolutely verify, try the new PSU in another system. I tried switching the outlet, the buzz got quieter.

Power Supply (Corsair CX750) Buzzing, Coil Whine Probably

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