Please Help! My Powerbook will not boot up and is SCREAMING at me!

I went to change my laundry and when I returned my mac was emitting a high pitched "scream" from the hardware (not from the speakers). It would not respond to any commands.
I removed the battery and now it will not start up...it will go to a grey screen and make that very loud screaming noise...it sounds like it is coming from a moving part (the hard drive or fan). What should I do?
Thank you all for your time!

hard drive is located in the lower middle of the case, under trackpad, if noise comes from that area could be failed hard drive.

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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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PowerBook will not boot up

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

Please Help! My Powerbook will not boot up and is SCREAMING at me!

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