Hi! Just got a iMac 27" that stock model with 1gb video card and 7200hdd. Have use it for some hours now, should the fan run slow all the time? Cant feel it sucking air in to the bottom or let it out from the rear of the screen? Seems like i only could hear the hdd is on even after a couple of hours. Maby it only run when it need it? When the air arrive into the iMac, where do it take the way inside the computer? Just curious since it is placed in the bedroom where it is more dust than it is on another room.