I have a Thompson video sender which sends a picture perfect (or near enough) signal from my Tivo to TV upstairs, but cannot get a decent picture from my PC. I have an ATI card which I think I have configured properly for dual display, but believe the problem to lie with the output from the PC to video sender. The picture is fine, but in black and white if I change the output to be NTSC on my ATI configuration. In PAL the picture is very poor (but in colour), and am wondering if it is a Hz problem. Any ideas!!