23 inch and Powerbook G4

I am using dual display with a 23 inch cinema display and my Powerbook G4. It works great, but I would like to just disable my Powerbook's display completely, so that the entire desktop is on the cinema display. I haven't been able to find an option to do this. Is it possible? Thanks!

Hi, I have a setup similar to yours, I just close the lid down on my powerbook, the system then sleeps and I then wake it up using my external mouse or keyboard.

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