my pc is emitting a strange squeaking sound when it runs; like a squeak that would come from something that is spinning (imagine the erratic sound of a squeaky hamster wheel). can someone help me figure out what it is? I opened the case and it's not coming from the hard drive (thank god) but from somewhere in the back of my computer like the power supply or the cooling system. any pointers or advice is greaaaaatly appreciated. thanks!