I thought my CPU heat sink fan was making noise, so when I heard it for an extended period, I opened up my case. Turns out it didn't seem to be coming from the fan at all. The fan was running smoothly and didn't seem like it could be making that noise. It seemed to be coming from the direction of the ATI card. I take out the PCI16 AIW, boot up the comp, and left it on for 7 minutes. Bingo. Quiet as a mouse, no noise.. Put it back in, things seem quiet, then boom, it starts up again. Anyone else have similair problems?