3M MP7740i Projector no input is detected

Question

The projector turns on and works, the picture is great but all i can get is the main menu. When an external source is plugged in it maintains saying "no input is detected." I have tried plugging in multiple different auxiliary sources through different means (A/V, RGB, S-Video) but nothing has worked. it seems like everything works perfect on the projector except it cant detect input... any ideas?