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If there is a port for computer audio (3.5mm jack) you can buy at converter for RCA stereo to headphone jack. These can be bought at mostly any radioshack. This is what you'd be looking for:
You will need a Mini-DVI to VGA adapter.
Apple sells this item through their online store.
You will also need a male to male VGA cable to attach the adapter to the projector.
You can find modestly priced cables at monoprice or other retailers.
Plug the cable into your projector and then plug the adapter into your MacBook. The MacBook will automatically resize your picture to the appropriate resolution for the projector.
if the lamp shuts off and the projector still runs, it's a cool down mode, and will shut off when it reaches a low enough temp. if the lamp doesn't shut off and none of the keys work, the keypad may be faulty. or locked. some projectors have a keypad lock feature that makes it so only the remote can be used. check your manual for keypad lock/unlock.