I was hoping for some advise on a a problem with my home theater set up. I have a HK 225 receiver and am unable to get Dobly Digital or DTS surround sound to work. I am using a optical coaxial cable from my dvd player and s-video from DVD to receiver and then to TV. If I am playing a movie I can't select DD or DTS on the surround sound toggle and if I stop the movie and selet either and hit play the receiver sends me to "surround off" mode. Any suggestions? Thanks