Hello all, I recently purchased a 3M Projector (MP8640) second hand. I was told that it powers on and has a good bulb. That is indeed true, but when I power it on, all it displays is a plain white light on the wall. When I push menu, nothing pops up. If I hook a computer up to it, there is also no display. Any idean what could be wrong with it? I'm fairly good at fixing computers, so I have no problem with opening it up if you think there might be a wire loose. Thanks for your help.