I have read all other threads about this error and nothing really pertains to my issues. I am using boxes at a condo that I have purchased but do not always live at, I have recently moved from that condo to a different condo and began experiencing issues with it. Here's the story: (last september) I took 1 of my HR20-700 HD DVR boxes from my home and purchased a secondhand Slimline dish that had the lnb w/ 3 sensors I guess you could call them on it. I got a hold of a guy that was a subcontractor of DirecTV and paid him 100$ to come and mount it, point it, and make sure it was all working. He had run the Dish to "B-BAND" converters and then into the box in satellite port 1 & 2. It worked great for 6months and then when I moved to a different condo I took it down and figured surely I could put it up myself after I had seen him do it. I got all settled into the new place, repointed the dish using a compass and the settings provided on my receiver per zip code. I was pretty confident with it and setup my receiver, I got a 771A error pop up. Tried a new LNB and still had same error. A buddy of mine knows a little about DirecTV and said to try and use the SWiM LNB and gave me one, and I still have the error. After I have tried everything I can think of, the solution that I have come to is the PIs INSIDE the receivers went bad is the only reason it wouldn't have worked with the OLD LNB or the NEW LNB. WHat do you guys think?