Help!  G4 iBook won't start up

I had to shut down and restart my iBook two or three times in succession. On the final time, the iBook began to start up, but then there was a 'click' and it shut down completely. Now I can't get it to start up at all, when I press the start up button nothing at all happens. The battery is fully charged, I have tried it running off the mains, and have also tried holding down Shift etc. I can't start it up from the CD either, as it won't pull the CD in.
Can anyone help please?

Welcome to Apple Computer!
Here is an article that might help:
Troubleshooting: my computer won't turn on:
http://docs.info.apple.com/article.html?artnum=300552
It will recommend disconnecting all peripherals and resetting the PMU among other things. If nothing helps, please post back.
Good luck!

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