If there are any DTV gurus out there, I'm in need of some help. I recently moved into an apartment that is prewired for Directv. I had Directv previously, so I simply just wanted to plug in and go. The dish they have on the roof is a Slimline 5, so I set my receivers to use that at the dish. I have one D12 regular receiver that works just fine. The other receiver is a HR23 HD-DVR, and I keep getting the 771 message when watching TV. About 2-3 times every minute or so it comes and goes. On the wall in the living room is a single port to run my coax from, which I run to splitter, then into the back of my receiver. I think maybe the splitter is causing this to happen? If it is the splitter how do I get two lines ran to the back of my receiver since I cannot simply run the lines myself? Directv will charge me to come out as I've already called them, with no help. Anyone that can chime in would be appreciated as this is driving me crazy! Thanks.