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PSU makes a high-pitched noise

S

sm8000

Gawd
Joined
Aug 5, 2004
Messages
525
I picked up a small 200W mATX PSU for an old Socket 7 system a couple of months ago at Fry's. A couple of things bug me about it, one is that it doesn't have that 0/1 switch on the back. Oh well. But the other thing is that everytime the power cable (from the wall) is plugged into it, a quiet high-pitched noise can be heard. It kind of bugs me, I unplug it at night to get to sleep, and I'm wondering if there's anything bad I should be aware of.
 
Usually that sound is caused by the power inverters in the psu resonating. While being annoying as hell (IMO a sign of a cheap psu), there is nothing to really to worry about.
 
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