My iBook G4 does not start or boot. The screen does not light and the start up chime does not sound. What should I do? Please help.

But I think it still works since I hear noises inside the machine and the caps lock still lights up. It just won't start.

Hi, Toby. Welcome to Apple Support Communities.
Have you tried resetting the PMU?
http://support.apple.com/kb/HT1431?viewlocale=en_US
This is the first troubleshooting measure an Apple Authorized Service Provider would try.

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