I was just using my iMac, new, 17" C2D 2 GHZ model. It suddenly got VERY loud. I thought it was a web ad with a race car or something. It sounded like a jet going off, I don't know how the computer being so small could make such a "wooshing" sound. Then as this was happening Safari froze (which is not unusual, happens about once a day). I force quit Safari and it was not working. Suddenly the computer went black as if it had gone to sleep but then after a second it came back on and everything seemed to be the same and the sound has subsided. Right now it's making about the level of sound I am used to when I am active with it. When I first got the iMac it didn't seem to make any noise except for the hard disk clicking occasionally. Now there is almost always a hum. So I downloaded just now a temperature gauge. Right when I installed it Core 1 was 35 and Core 2 was 42. Now a few minutes later Core 1 is 33 and Core 2 is 39. What should I make of this? I'll call Apple tomorrow, I just wanted to make sure I wrote down all the info right away, I am worried about my baby which has been perfect up to the point before this!!!!!