Can anyone here tell me if it it normal for my iMac G5 Rev. B to have the fans go to 5600 RPM and Whine like a crazy %$&# when all I have open is iTunes, Safari, mail, and quicktime? I have a box fan in my room now at full blast and I can still hear this iMac whine over it. My CPU temp. is at 73 C. I'm just wondering what Apple would do if I took it to the Apple store near me. I called AppleCare and they said to take it to the Apple store. What can be done? Is this normal??