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John, the problem with CATV is that you cannot address grounding issues at the source. Remember the source isn't your cable box, but the source of the CATV signal itself at your cable TV provider's station. I also suspect that the thousands of other subscribers, if not just the ones in your...

After learning about ground potential differences and reading a few articles on HomeTheaterForum and other places, here was my original problem and here's how I fixed it: When I first set everything up (Infocus X1, Motorola digital cable, Sony HTiB, non-HD TV, and Playstation2) I had _two_...