Hi, I am new to home theatre. I just bought a sony home theatre system, model ht-ddw840. I will soon be getting a new dvd player but for right now, i am using my ps2. I cant get the DOLBY DIGITAL to light up on the display of the reciever, all that lights up is the PRO LOGIC display. How do i get dolby digital to work? My reciever is capable of it i know.