PowerBook will not boot up

Hi,
I've recently been experiencing a problem with my PowerBook intermittently failing to startup and would appreciate any help in narrowing down the source of the problem.
When I press the silver powerkey, I do not hear the startup chime, and there is no drive noise. However, the power indicator light on the power adapter changes to green if it was orange and the caps lock and num lock lights also respond, sometimes there is fan noise. Occasionally I have noticed a weird phenomenon whereby the num lock light responded to volume / F5 key rather than the num lock / F6 key!
Previously I have an encountered a problem where the computer failed to wake from sleep on a few different occassions. Could this be symptomatic of the same problem?
* Once successfully booted, the computer is fine and I can restart several times without problem, however once shut down I don't know if it will restart again.
* I have tried resetting the PMU by pressing the reset under the keyboard, the first time this seemed to remedy the problem but since then it has made no difference.
* I have run the Hardware Test CD and everything came out fine (HD, CD/DVD, Logic Board, RAM etc)
* I have just updated to OS 10.4.8 from 10.4.7 and that does not seem to have made any difference.
I read on another post that this kind of thing could be caused by a dodgy/depleted backup battery, however my main battery appears to be jammed so I can't remove it to force the backup to charge (any ideas on that too?!)
Hope someone can suggest something, its driving me mad not being able to rely on it...
thanks
Dave
Powerbook G4 (DVI) Mac OS X (10.4.7)

new,
Welcome to the Discussions.
Try the suggestions in this article:
http://docs.info.apple.com/article.html?artnum=16473

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Hello there,
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http://discussions.apple.com/thread.jspa?messageID=3950255
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