High pitched sound at seemingly random times Options

[Hintswen]

My computer has been making a high pitched sound at what seems to be random times. It's a long sound and can sometimes last for hours. It hasn't happened any time I have been in a position to take off the side of my care and try and hear what it is coming from though.

It would most likely be the power supply right?

[priorax]

Fine, let me refine my sentence.
From my single experience, as well as the specs on the Coolermaster Extreme, it is horrible, spend a bit extra, get a decent power supply