Powerbook won't sleep, just shuts down

I asked about this some time ago and nobody ever had any ideas. I was just curious if someone new had ideas.
My 12inch powerbook g4 won't sleep, if I tell it to sleep, or close the lid it just shuts down. I have changed the settings so that sleeping isn't an option and the screen saver comes on and then the screen goes to power save. The computer can stay like this for days/weeks but if the lid closes it shuts off. Any ideas? All the checks I have run haven't found any issues. I replaced the logic board about a year ago and the problem remained. So, it was either not associated with the logic board or both boards have the same issue. Not sure what else would cause this sort of issue.
I am now running 10.5.4.

sorry - should have added that I already reset PRAM, PMU, repaired permissions, ran cron scripts
Powerbook G4 1.67GHz Mac OS X (10.4.8)

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Quote
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Powerbook won't sleep, just shuts down

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