New Macbook Air stopped transmitting to overhead projector

Hello,
Up until last week, I was successfully using 2 different overhead projectors with my MacBook Air (purchased around 2008 or 2009). I've just bought a new MacBook Air, and it has stopped projecting. I use the same connector (VGA?). Seems like it worked at first (showing my desktop, powerpoint, etc.), but it wouldn't show Yotube. Later that same day, at a different projector, it wouldn't project anything at all.
Is this a common problem? What can I do?
Any help would be greatly appreciated. Thanks.

What type of input does the projector use? A lot use VGA, in which case you'd need this: http://store.apple.com/us/product/MB572Z/B/mini-displayport-to-vga-adapter

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