Trying to feed a video projector

I have a MacBookAir , Proc 1,7 Ghz Intel Core i5, Mac OSX (10.7.3). I bought a proper cabel to connect, through tunderbolt, my Mac to a video projector, using a VGA cable.
It worked perfectly the first time. I tried with a diferent Video Projector and it didn't catch MacBook signal. I returned to the first projector and it didn't work at all.
What's happening?

Dear SPForsythe,
believe it or not, if you turn MacBook Air off and if you turn it on the video projector recognizes the signal. I tried this with different video projectors.
Don't you know if there is a way of forcing the computer to "open" the way through the video projector as PCs do pressing F4?
Thanks

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