Originally Posted by Pete34
I had this problem before - solved it by switching power supplies. But sometimes switching graphics cards work. The whining is caused by capacitors/coils and no case can really damp it out.
Its actually a common problem - try searching "coil whine" and you will find alot of hits. It's kind of random. I had an older Corsair power supply in two computers (I think its a 520 modular) - the exact same supply with two identical computers..and only one whines and one doesn't.
Silencing should always be done at the source. The 'case' is just the icing on the top. The problem with cases like the P183 is that they have restrictive air input - thus while they might screen out some noise you will have hotter components.
One of the quietest air cases was found to be the gamer style FT02 because of its excellent cooling.
I agree competely. Just think of having a sound proof room, its virtully fully sealed air can't travell freely in or out, but you silenced the sound(cases are the same virtually) you will limit the air flow, and damening materail can only do so much to dampen the noise. I would unplug the psu and plug it in a old motherboard, just to see if that is whats making the sound. Or the gpu too, once you isolate it, then consider a good case with good air flow. Any fan above 20db i dont like, maybe you might be like that too?