i bought a brand new 24'' al imac on last october. it was very quiet, and cool however, i can hear it more now. i think it is the fans. it does need that much cooling as the weather is already cold in the uk and i dont like sweating into my room. if i run tiger or xp, the same level of noise. and it is becoming more noisy ever day. performance is great, except tiger is getting a lot of dumbed preferences that slows it a bit. so i dont really what the problem here. anyone has the same issue, knows the probelm, sloved it? i really like apple products for their low levels of noise and i assure this imac is not as quiet as the day i got it.