I have DirecTV, Pioneer VSX-820 A/V receiver, Polk sub, and 5.1, an HP Elite desktop computer, and a Samsung 52" B750 HDTV. Up until a couple of days ago everything was fine. But when i tried to move my PC up off the ground (only about a foot), i lost the Audio. I'm getting no sound from my Pioneer. To watch TV i have to use the Internal speakers, and using my PC i get no sound at all. I did notice that 2 things have happened: my Optical cable no longer connects to my receiver (is it broke) because it doesn't stay in. Also, my Ant In on the back of my TV is not connected to anything, don't know if that's the reason but i checked everything. My TV is perfect and my PC is fine, but the Audio has me perplexed. Any suggestions?