hi guys, i have an 20 inch alu imac, and i got it when leopard released. but anyway it was quiet all the time, until two days ago, the fan started spinning at max speed, from the time i pressed the power button. it sounds like a mini vacuum cleaner! noisy! i checked istat for the fan speed but it did not indicate the fan speed. so i tried smcfancontrol and it too did not display anything. i did a hardware test and everything seemed to pass. should i bring to repair or is there a better solution? sigh, why must i repair every apple product i got. T.T