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Looks like the Apple PMU driver is causing you these troubles. Have you any equipment connected to your machine through FW/USB? Try to disconnect them for a while to see if that helps, especially speakers or the likes.
Also, what kind of upgrade to 10.2 did you do? I recommend doing a backup of all your files, then reinstall from scratch with the format option (so make sure your backup is on another media). I have seen several people struggling with 10.2 that scored jackpot after reinstalling with format.
Also, check out the bulletin boards at apples support site.
Regards,
Egil
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