I have a question about weird powerbook behaviour: it's making strange noises. Like, really strange. Every keyboard or mouse event seems to generate a very, very quiet click from inside the machine; moving your finger around the trackpad sounds like a geiger counter.

It's not the audio system -- turning the speaker off doesn't stop it happening. I don't think it's software-related, either (certainly my iBook didn't make these noises, and neither does the desktop G4 in the next room). It doesn't sound like the drive seeking. It might be some kind of electrical interference directly tweaking the speakers, but I don't particularly want to start opening up the laptop and snipping wires to find out. Anyone got any ideas? It's driving me nuts -- I get paranoid when computers do things I can't explain ...

Update: I found other Powerbook owners complaining of the same thing at Powerbook Zone, so it's not just my imagination. Weirdly, the noises stop when the machine is running on battery juice and the CPU is throttled back. So it appears to be something related to the CPU cooling system ...

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