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I've got the machine sleeping peacefully. But I want to make sure I understand: you are saying it's normal for the right fan to be at 0 when the left fan is active? This might be normal: maybe the right fan handles a different part of the computer which doesn't need the cooling at that point. I...

My PowerBook (G4 Aluminum 1.67 Hi-Res) has made a low "grinding" noise in the upper left when the cpu is under load for a time: this seems to be the left rear fan. Some time ago, though, it suddenly started making a high whine, after some time of activity. Sleeping the computer or decreased cpu...