I bought a Lindy 7.5m DVI cable when I got the Yamakawa, but I never got it to work properly - the image was always 'posterized', all colours were full saturation. I gave up after the usual fiddling around, and Lindy wouldn't take the cable back without a 'restocking fee' that came to half what I'd paid. PJ is an Optoma H56.
Seeing the previous post about running the PJ off the computer video card I just tried it - got a very nicely resolved Windows desktop via the same Lindy cable (it reached as far as the computer in the next room !).
So finally I know that it is the player.