Hey all. My DP 1.8GHz PowerMac just started making a squeaking sound today... it is clearly a fan squeaking but I can't pin point it. It sounds like it is coming from the fan next to the hard drive but when I stop that fan I can still hear it. I also stopped the other fans for a second to see if it was any of them and it is not. There looks like there may be another fan behind the fan next to the hard drives against the back wall...? Is this the case? If so I think that is where the squeaking is coming from. Has anyone else had this problem before and how did you fix it? Thanks!