MacBook Pro won't display on projector

I have a 17" MacBook Pro (original) with the full-size DVI connector for external displays. My co-worker has the 15" version of the same MacBook Pro. We can connect LCD monitors to either one of them and they work fine. I can also connect mine to our classroom projectors with no problem, but his will not work with the same projectors, same adapters, same cables, no matter what we've tried. The projector just says "no input." Also, his will not start up properly with the projector attached. It hangs, with the spinning ball, at different places in the startup. Sometimes you get the menu bar, sometimes the menu bar and the dock, but no desktop icons.
Any ideas?

The typical convention is to attach the external device to the DVI port before starting the computer. During the startup polling, that tells the computer to expect the external.
Have you tried a regular external monitor with either computer? If that works, it suggests something amiss with the cable or the projector. Have you searched the projector's web site for any mention of not liking Macs?

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