How do I connect to overhead prjectors?

I am trying to connect my Macbook Air to overhead projectors for meetings.  It worked before I upgraded to OS X but now it will not work.

Are you connecting to an overhead projector or a digital video projector?
Which model MacBook Air do you have?
Did you upgrade to Mountain Lion from Lion or  Snow Leopard? Was it working under Lion or Snow Leopard previously?
A number of people are having issues connecting to digital video projectors in these forums on the MBA 2012.
I suggest browsing the "More Like This" threads on the right.

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