One Quickie

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Stopping a chirping G5 (Hacks->Random)

Some (many? all?) G5s make a quiet chirping sound at one-second intervals, like a quiet cricket. It might also chirp when dragging windows or doing something with expose. If that bothers you (like it bothered me), go download CHUD (which you should have already), go to the Processor system preference panel, and turn off "allow nap". That may shorten the life of your machine. But what that means, I have no idea.