Need some good advice on a snag i have. I have a hitachi pd 42 5300 plasma with DVI input and recently purchaced a 10m DVI to link to my pc the graphics card is an xfx geforce 6800 with duel DVI. after connecting the plasma screen shows the picture but it is very patchy in lots of different colours. i have linked the pc with the standard cable and all is well. is the cable to long or just faulty?