I am running a hdmi 50 ft cable from my hd Directv receiver from one room to a tv in another room. When I run the cable across the floor it works perfect. I then ran the cable through the basement and walls and now I get no signal at all. I have tried this with 2 separate 50 ft hdmi cables and both work perfectly when not run through the basement and walls, but once I ran them through the walls and basement I get no signal. Could someone please give me some suggestions on what could be the problem and how I could solve this? Thanks.