I have A powerbook G4 it come on to the Apple logo then does nothing else

I have a powerBook G4 the screen come on to the Apple logo then thats all it does ?

What model PowerBook & what OS are you using?
Will it boot OK in Safe Mode? See What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392 Takes a while to run, but it usually "fixes" problems.
Safe Boot takes longer than normal startup
http://support.apple.com/kb/TS1884?viewlocale=en_US
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://docs.info.apple.com/article.html?artnum=106214
 Cheers, Tom

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