hi all. i seem to be having problems with my picture. i have the draper luma 92" screen and have the projector mounted on a tv bracket approx 10ft away from the screen. a pioneer dvd 505 player, 10 metre s video lead connecting them. my problems are a nicotene yellow patch on the left hand side of the screen and a rainbow effect patch on the right and when selecting ntsc playback, screen flickers. any help would be appreciated. thanx.