I have three receivers. One hddvr and two hd receivers. One of my hd receivers was out this morning with a searching for satellite error message. Fooled around with it all day and have determined its not the receiver. Short story is unhooked one of the two signal inputs on the hddvr and found that my other hd receiver began working again. As soon as I plug the cable back in On the hddvr it goes to searching for signal. Any idea what might be wrong. Thanks in advance for any help provided.