This has stumped me and some of my other colleagues. I went on a service call to a house where the oweners said that the dish had been struck by lightning. To make a long story short, I practically did a new install. New dish, new dual coax from the dish, new multiswitch, and new cable from the multiswitch to the receiver. I get no signal a the receiver at all. So, I tried swapping out the receiver to see if that was it ( I actually did that first) That didn't help. Somebody thought that maybe removing the grounding plug from the outlet might help, but I don't know. I have, one by one, eliminated every physical problem I can think of. Any thoughts or suggestiosn as to what to try next.