I have tested it with a dmm and the rails are fine, I was thinking that it could be faulty and producing a lot of ripple. It sounds like arcing or sizzling, I have heard something similar when I had an amplifier with a faulty power switch. It just doesn't sound right to me.
What brand was the psu you had that also made a noise even when pc was off?
Apparently the Silverstones commonly make a buzzing sound but it concerns me, I have never heard one do that. Especially when the pc is off.
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