My iMAC "accelerator gets stuck wide-open"

After putting my iMAC in the sleep mode (and me, too) I will discover later that my machine is making a loud noise. Racing -- sort of like having the accelerator stuck on a car. Has happened several times when "we" go to sleep, but not every time. I always "quit" all programs and watch the screen go quietly black before leaving the room. Perhaps the "ploglies" are sneaking in and playing NASCAR? Any suggestions will be most appreciated.
Bob
I have an iMAC G5 Mac OS X (10.4)

Bob, could it be that the iMac is imitating your
snoring???
However, it's easier to cure on a machine than on a
person, just try resetting your SMU, which controls fan speed.
Do post back and let us know if the problem is
solved,
Miriam
Thanks for the helper, Miriam -- but I still have the "fan accelerating" problem. I followed the instructions to Reset the SMU, but the next time I put Annabell (my G5) to sleep, I caught her fan accelerating again. Maybe I should reset the SMU again? Sure would like to hear any advice.
bob at [email protected]

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