Ever since I bought my iMac G4 from another user here at MR, the fans on it have been going non-stop and it's kind of irritating at night when it is the only thing you hear. I have been told by a few people that this isn't normal. Even when the display is off and the system hasn't been used for hours, the fans huff out air through the top vents. I checked Activity Monitor and CPU usage is normal (below 10%). The air coming out of the base isn't even warm at all. I want this thing to quiet down! Is there anything I can do? EDIT: sudo fs_usage shows WindowServer making CACHE_HIT calls or whatever like 40-50 times a second. Is this something that could be a problem? On my PB, there is basically nothing going on when you run that terminal command.