Mini DVI to VGA Connector

Hi I am trying to connect my Macbook to a projector via the Mini DVI to VGA Adapter. My Macbook recognizes the projector in the system preferences but the projector says no signal. I have tried every kind of arrangement, of computer on first, or projector on first and have had no luck. Then I tried connecting the same Mini DVI to VGA to my hp Monitor at home and that works just fine.
Can anybody give any ideas as to how to fix this? I have had to use my wife's crappy PC 2 weeks in a row to run my Power Point in my class. I need help!

I tried all the resolutions that I had available. I tried different combinations or resolutions with different Hz rates. I also tried putting them both on the same resolution with the same Hz. I also clicked detect displays and nothing happens. When I first plug the projector into my Mini DVI port the projector resolution and Hz, and the LCD resolution and Hz automatically change to the same.
And what kinda weird is that my assistant professor in the class has an old G4 Powerbook and he can connect up to the same projector instantly. Is there any way of posting a pic, because I took a screen capture showing what my comp. looks like when i plug it in?

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