Well, I checked all of my fans and it looks like nothing (no wires or anything) is getting in the way. The noise goes on and off sometimes at a frequent pace (for hours and hours) and at other times it just disappears for several minutes. The noise screeches for like a second and a half and then stops for a second then goes on again....it's not on continuous hum or anything. It sounds like something is scrapping against another at short intervals. A friend of mine listened to it and his only guess is that it might be the hard drive. But if my hard drive made sound like this, why would my comp still work? Anyone know how i can figure out what is causing this noise?