Ok, i just got a PS3 and i am trying to hook up surround sound to my Onkyo receiver model # TX-DS484. I have an HDMI plugged into my TV and an Optical plug running from the PS3 to my receiver, but am getting NO sound through my speakers. I changed the audio settings on my PS3 from HDMI to Optical, but i just get no sound. My receiver doesnt have any HDMI plugs so thats why i am using the optical route. HELP! Its bugging the HELL out of me!!