The computer recognizes the projector, and IDs it in the "displays" menu, but the projector -- both an In-Line and a Hitachi projector -- does not recognize any computer sending input to it.
I have found other users reporting the same problem, but no one reporting a solution. IS there a solution? Contrarily, is there a particular make/model of LCD projector that does NOT have this problem? (I'm frustrated enough to consider buying my own projector for my classroom.)