We have a new plasma TV and surround sound system hooked up to a DVD/blueray and our cable box. We had it hooked up by professionals and it has worked great for months. Last night while watching TV, the sound just quit. But we still get sound if we listen to the radio through the receiver, play Wii or watch a movie on the DVD player. Have checked all connections and are all still secure. Tried the "help" function on the universal remote to no avail. Help!