I have a 2 sets of Scooby Doo dvds that my surround sound will not play the sound the picture is fine but the sound won`t play, its the only ones that i have found that don`t work- others dvds work fine. Why would the sound not work just for those dvds? Also the surround sound speakers won`t work with satellite, and the tv speakers won`t play with dvd only the surround sound speakers will.