Heres the deal Purchased a Onkyo HTIB s790 7.1 system. I ran a digital coax from my Samsung HD DVD players digital output to my recievers Digital coax input, and a HDMI from my DVD player to my tv. When I select DTS 5.1 on my Pearl Harbor DVD (not Dolby Digital) I get absolutely no sound. When I select Dolby Digital 5.1 it plays perfectly. What could casue this problem? Would there be a setting on this reciever that I have set incorrectly. Shouldnt it auto detect this DTS format if I have autodetect selected on my reciever. Also when I select surround modes while normal playback of Dolby Digital 5.1 is playing I cannot find Dolby Digital EX, the only settings that show up are the dolby prologic modes,and the neo6 cin and neo6 music, which both display the little red DTS Icon above, and this DTS icon (which I can only play on the neo6 mode) is also present when I choose the DTS playback (even though Im getting no sound). Sorry if this is long but I hope it makes sense.