Hi all you wonderful tech savvy guys (and gals). I'm having some strange noises coming out of my PC. Sounds kind of like the power supply fan hitting something (what it could be hitting, I have no idea.) There seems to be some debat among my local techies on if it's a power supply, or if it's a hard drive (I have 2 in the machine.) What's your best guess? It's a 3 year old machine (Dell Dimension 4500) with a 250 watt power supply. The oldest of the two hard drives is probably 4 years old. Any thoughts?