External VGA Projector Screen Blue when MacBook Pro Connected

I love using my laptop for Powerpoint and Keynote presentations at work. I used to have a Powerbook 1.5GHz 15" and now have a MacBook Pro 2.2GHz 15". With some external VGA projectors, after connecting the MacBook Pro, everything works great. I turn off mirroring and my presentation goes smoothly.
However, with some particular external VGA projectors, I get a connection problem. After using my DVI-to-VGA cable to connect my MBP to the projector, nothing happens. The projector continues to project a blue screen as though nothing is connected to it and as though it has no video source. I've cycled through the projectors input selections hoping the projector would find the signal but still nothing. I've even restarted my MBP with the cables attached to the projector and still the projector shows a blue screen.
My friends can connect their PC Windows XP and Windows Vista computers to this same projector with no problems. I used to have this same problem with my PowerBook G4 which is one of the reasons I upgraded to the new MBP hoping this problem would be resolved. What's wrong and what can I do to get my MBP compatible with the external projector?

Sorry, I meant the cable that links between the connector and the input to the projector (RGB - IN by the way, not OUT).
We have a number of these VGA cables at my place of work that will work with a PC but not a Mac. Some are fine. My technician holds on to a cable for me that we know works and if I get a bad one, he brings in the replacement and it takes a few seconds to go online. I also note that some of the projectors (particularly ceiling mounted ones) have an additional adapter between the cable and the projector. It may be that some of the pins are not connected.
Of course, if the projector is mounted too high, that would not allow easy replacement.
I would suggest finding a cable that works and carrying that around.

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