Ok. I bought the video on Home Theater Setup. I have speakers in a 5.1 surround sound setup. I have a Sony NS400D DVD player connected through a composite cable for video and the optical cable for sound. When I run through the setup DVD and it goes to test the DTS settings, nothing plays through the speakers. I just noticed that when I play a movie, the Dolby Digital light on the reciever doesn't come on either. Am I missing something here? I have picture, I have sound, just not in 5.1 or DTS. I set the receiver to different settings, but still nothing. I want to cry. I know computers, I can hook up a complicated WAN/LAN network in my sleep. I don't know home theater. help?