I have been helping my father in law with his system. He bought a new JVC dvd player about six months ago. He was not getting sound to his rear speakers. I tried everything I could think of and it ended up being the dvd player. Wether through a coaxial cord or rca, it does not produce the rear signals (we went out and bought a new receiver as well) I finally brought over my player and hooked it up and it worked fine. We are bringing it back, but what would make that happen?