I have a Windows XP Media Center Edition 2005 i get my TV from an outdoor antenna. I hooked up scanned for channels and all i get is channel 4 with whats ever on at the time with no sound. But i know it' not on mute because i switch the channel and get the black screen with the staic sound. I also tried hooking my other digital converter box to the tV up stairs that rune with out media center. (which also gets it's signal from an antenna) and all i get is channel 4 with no sound. What should I do?