MBP crashes (turns off) when connected to projector

When i connect my mbp to my sharp projector using the included adapter the computer just turns off unexpectedly after about 8 seconds or so. Any ideas whats causing this?
macbook pro   Mac OS X (10.4.6)  

I am having a similar problem, when I connect my MacBook Pro to an external projector through the DVI-to-VGA adapter. It will eventually kernel panic and I have to reboot. After rebooting, it will eventually kernel panic again, usually within a few minutes.
This never happened in the same setup with my PowerBook G4.
I hope this is fixed quick, I teach with slides and this makes my new computer unusable.

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