Bought a brand new iMac 24" 3.06GHz 4GB MEM 1TB HD 2 weeks ago.
Soft hum, but enough to go nuts.
Returned it, and today got a new one.
Same story.
I've read about this hum on different fora and ppl try to locate the problem.
But I noticed putting the system 2 feet from a wall actually solves the problem. Now that's great if your desk is in the middle of the room, but not the case here.
So this one's going back as well and I don't want another one.
I have a white 20" and a recent aluminum 20" model both are DEAD SILENT. No hum, no squeeck, nothing...
I think it's a serious flaw of the 24". At first I thought this new 3.06GHz processor needed some serious cooling but seems the 2.8GHz suffers the same problem.
If you install iStat Pro from
www.islayer.com one can read the fan speeds.
1198-1200 rpm all the time and according to others it's same on both 2.8 and 3.06 models.
So I think Apple missed something here or they all have their pc's @ least 2 feet from a wall.
So tomorrow this iMac is going back, no compromises. Sorry Apple !