Last night, I tried to watch a standard def channel but kept getting pixels and the dreaded 771 message. But, when I'd switch over to an HD channel (or the SD of a HD channel), my picture would be fine. We had heavy rain yesterday, so I thought maybe there were just some storms in the area. This morning the problem was still there even with clear blue skies and nothing on the radar. I restarted the receiver and did all of the updates and still nothing. It seems to be getting worse. Shockingly, this is the only "normal" acting receiver on our whole home. I plan on swapping this receiver out with the other one downstairs, but I just wanted to see if it would be a waste of time. I checked the signal strength on all of the receivers and they all seem to be in the low 70s (except for the troubled one which is lower). Could this be a dish alignment problem? I just don't want to pay $50 for DTV to come out here and make something up. The receiver is a h24/700. (One more question...if I decide to replace the faulty dish with my old non-HD tivo, can I just swap the access card out and put it in?) Thank you!