I received my late 2006 17" iMac yesterday and am absolutely chuffed with it. However, OS X is handling the fans in a very odd way; I downloaded smcFanControl (as I do on every Mac I own) & was looking (& listening) to the fan sensors. Idling, the ODD & HDD fans are at 4000rpm, whereas the CPU is only at 1000. It's making quite a noise. Then, when I boot into XP via Boot Camp, every is silent, even when playing a pretty intense game. Is this natural? Are the fans automatically defaulted to a higher RPM in OS X? I'd just like to find out if it's a software issue before opening him up & taking a gander myself. Thanks.