hi ive recently purchased a sony kdl40x3500 lcd tv, sony rht-900 home theatre system, and a s,ony s350 blu ray player. i'm having trouble with setting it all up i've got the tv going into rht-900 via hdmi and my bluray going into the rht-900 via hdmi but when i play blurays i cant sem to get the blurays to play in true hd and dts they always play in pcm please any help would be most appreiciated as i'am a complete novis at this do i need optical cables as well as hdmi