My new Macbook Pro 13" won't register properly on our school's projectors when I try to run PPT!, My new Macbook Pro 13" won't register properly on our school's projectors when I try to run PPT!

My new Macbook Pro 13" won't register properly on our school's projectors when I try to run PPT (Epson EB510)!  Instead, colored bars go across the screen against a black background.  No matter how much I try to adjust the displays, PPT won't show on it.  However, my friend's Macbook Air works fine. She's 10.7.2, I'm 10.7.4, so we're both more or less OS X Lion.  What could be wrong?  Can I do anything to fix it?

Make sure that your display is not mirrored. Mirroring forces you into "lowest common denominator" screen resolutions that can safely be displayed on BOTH screens, which may not be good enough for the projector.
When you turn off Mirroring, you get Extended Desktop, where the two screens are joined along an edge to form a larger Extended Desktop. To use this, drag a window onto the "other" screen.

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