Well, I'm at a loss. Your comp screen and projector are similar resolutions so it shouldn't be any more taxing on your proc, vid card, etc to drive either one. Are you trying to drive both at the same time?
Usually you can toggle between the laptop screen, external output, or both by hitting "fn" key (by ctrl) plus one of the F keys. On my laptop, it's F4, and has a symbol that looks like a VGA port on it. Some say "LCD/CRT".
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