How come i only have the cpu whine when plugged in?

Seems like most people have it on battery but I have it when running on power. its not to loud but if i am in a quiet room its kinda nerve racking. Like running your fingernails down a chalk board. i don't get it in XP so that means it must not be a hardware probelm.

Richard,
I tend to agree with you that this is a software issue in so much as it is rectified with a software solution.
I get the whine only unplugged.
However my Powerbook G4 would make the same whine only when running edonkey 2000. The same high pitched staccato whine would occur when that program was running. And the G4 was otherwise altogether free of whine.
When I run the 'mirror' fix my CPU cycles get routinely as low as 1% 3% and I have a quiet machine. So whatever is fixing it is not using up a heap of processor cycles by any means.
It should be easily fixed once Apple investigates what it is about the 'mirror' software that sorts this out.
People who imagine that a company is going to recall thousands of machines for hardware fixes for a noise is dreaming when there's such a straightforward software fix.
In that sense it's a software problem.

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How come i only have the cpu whine when plugged in?

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