I've had my Optoma 739 DLP projector for about 2 years now. Up until now it's worked fine. Then the other day, while we were watching, the colors started flickering and then went away. The picture is still nice and bright, but it's now grayscale, except with very faint pink and green tinges. Powering it off and back on restored the colors, but after a few minutes they went away again. I know it's not the input video or cable, because even the on-screen menu has no color.
I don't understand how a DLP would do that. Anyone have an ideas?