Mac Won't boot in tiger but it will in 9.2

Hi
My power book g4 will not boot in OSX tiger but it will boot in 9.2
tried zapping the pram disconnecting all I get when starting up in OSX is the gray screen with the moving cog
please help. the last thing done was I updated itunes
Thanks

when starting in OS X, maybe try holding down "shift" key for safe mode:
http://docs.info.apple.com/article.html?artnum=107392
http://docs.info.apple.com/article.html?artnum=107393

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