We have a Samsung TV hooked up to a Samsung TV/DVD player and a small Magnavox electronic thing that has one red light when turned on. I have no idea what it is. The problem is that cable TV comes in very fuzzy. Sound is OK, and the DVD player works fine with a good picture. There is also a button under the TV that is in the proper (off) position. If I push the "on" button for that Magnavox thing the picture is great, but as soon it sets itself ... in about five seconds ... I get a blue screen. I don't know how to set up the menu so that the picture comes in clear? It worked at one time. Thanks for any help rendered.