The tuner is a HR21-100. I changed the set up from dual tuner to single and it seems to be working now. Thanks for everyone's help.

We have a standard definition Directv DVR that we were told by Best Buy would work with only one satellite line even though the receiver is capable of accepting 2. If we put the line in Sat 1, the receiver constantly searches for Sat 2. While it is searching, if we move the line to Sat 2, the...