Have you told the 990 configuration which input is associated with the DVD player? Page 23 describes this process. You will have to specify a video input and an audio input in the configuration menus. Make sure to write these settings down so you can use them in the future. You can specify that the DVD uses the optical input for audio but you will probably get better performance from analog. I have both the analog and the optical hooked up on my 990. For stereo music I think I prefer the optical over the analog. I don't have my 990 with me at the moment so it is a little hazy as to its connections. Start on page 23 after your connections are made and recorded and step through the menus.