Macbook mini-dvi -- VGA projector problems

Hi
At the school i teach at we have problems hooking up our new macbooks to one of our projectors. We use a mini-dvi --> VGA cable to hook up the projector. The mac recognises the projector and it gets listed under screens, the resolution also changes. But no picture is beeing projected by the projector.
If we use a mini-dvi --> s/video/rca cable it works fine, but the quality of the picture is too low. The projector works nicely with the older macs we have, wich use the mini-dv --> vga cable.
Any toughts on what may be the problem, or what we could try?

I am having the same problem. I have to do powerpoint presentations at college and it was so embarrassing to go up there and my macbook not sync up. It use to work. I even bought a new adapter. It did not fix the problem. All the windows laptops were able to sync up to the projector but mine did not. This one one of the main reasons I bought a macbook. I need to take my work to school and connect to projectors. I am using the mini-DVI to VGA adapter. There appears to be no physical damage. When I click detect displays nothing happens. Now I have to redo everything on windows. Please, I hope someone has a fix for this. I am using the following; 2 GHZ Intel Core 2 DUo, 1 GB RAM, Mac OS X 10.4.10

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