Help! Computer turns on but then will not boot up - Please Help!

I have no idea what happened to my Apple. Someone please help me. My powerbook currently is running on no battery (recall victim) and now the entire computer is no longer functioning at all. I installed iTunes 7.0 and then the trouble began. I had to restart the computer, so I did that and then the computer just wont boot up. It goes to the grey screen which shows the Apple symbol and occurs right before my log in then just continues to read. The green light for the battery is function and nothing at all is working. The computer simply will not boot up, I have tried unplugging it for the night and then rebooting it and nothing. Please someone help, what has went wrong?

You mentioned in your other thread that you had trouble with a cpu(0) hardware error trying to use the hardware test disk. Is this the hardware test disk which came with that particular machine? If not, then you need to find the original hardware test disk that came with that machine. If the restore disks that say 12" Powerbook include the words hardware test, use those instead and follow these directions:
http://docs.info.apple.com/article.html?artnum=86287
If you are using the correct hardware test disk and you get a cpu(0) error using it, then the machine has a hardware problem.

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(='.'=)
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Help! Computer turns on but then will not boot up - Please Help!

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