Powerbook G4 1.33ghz 15" Screen turns dark after a few seconds

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Joined: Feb 1 2008
Posts: 5

Hello there
I have a Powerbook G4 1.33Ghz 15inch....
My Screen turnes dark after a short period.
My Mac still runs and i have connected another Monitor...
When i switch my Screenresolution the Screen on my PB switches on but flickers and turns dark again......
Any Help/Suggestions??