I have a 722k and have it set to modulate TV1 on cable Ch. 123 and TV2 on Ch. 125. When I tune to Ch. 123, I get static. On one of my old TVs, I get a black and white picture with pure static for the audio. Ch. 125 is fine. If I change the modulator settings to different channels (both cable and air), I still have the same results with TV1 being snow and TV2 being fine. I have also tried resetting the receiver without success. Any other ideas before I call Dish and try to get another 722k?