Ibook G4 Turned off and I can't get it to turn back on

My Ibook G4 turned off while I was listening to music and won't go back on. It was plugged into the wall and the battery is charged. Help me!

Hi, and welcome to Apple Discussions.
Check out Apple's Knowledge Base article on troubleshooting portables that won't turn on or start up.
Maybe something there will help.

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