Hellow.. Just got my new 24" iMac a few days ago. It's big (no, really??), and I'm really loving working with it. So far, I'm not missing Windows. A tiny issue here.. The machine emits this humming sound (yes, humming is the best description), which can be heard clearly if you are allergic to noise (and if the room is completely quiet). Though it is NOT loud. I preferred to have the brightness of the screen down to about 25%. If I set the brightness to the highest position, the humming sound is ALMOST gone. Set the brightness to the lowest, the sound is very clear. At about 25% where I prefer it, the sound is also clear. I already guessed that it's a "normal" sound from the machine, since it's very vague, but.. Anyone recognize this "issue"..?