MBP worked with my BenQ projector for a year and then all of a sudden won't connect.

I have been using the BenQ MX511 projector with my 13in MacBook Pro together for at least a year.  I just hooked them up and everything worked!  Then a couple weeks ago, I tried to hook them up and the projector was telling me no source found.  I usually use a HDMI cable with the Mac adapter - so I tried the VGA cable and was able to make that work with a resolution of 800 x 600, but that was too low to allow my PowerPoint software to work.
Now I have a presentation to do again (tomorrow of course) and try as I might I can not get these two machines to talk to each other.  I cannot think of anything that changed - maybe updating Lion to 10.7.2?  (My daughter used the Projector with her PC a few days ago to watch a movie - no problems.  I cannot believe I may have to use a PC to do my presentation!)

HDMI cables have a lifespan.  Yours hit it.  Remember the simplest solution to the problem is usually the best.

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