I am not very good with this kind of stuff so be patient. I bought a HD72, hooked it up with HDMI to my cable box HDMI that is also High Def capable up to 1080i. When I go to the high def stations, I get a green static over the whole picture. To fix it I go to the cable box menu and 'de-select' 1080 and 720 and just have 480 checked and the green static goes away....but then I look on my cable box and it is running on 480 obviously when I should be able to do 720 without the green static...what gives? Any advice??