If you go to the main setup page for the AVR 525, you can select which inputs are used at what times (what you select). The default for when you hit DVD is for the DVD S-video input to be used and Coax 1 to be used. If you're using digital coax or optical for video, set that to the DVD input. To use analog for CD (why? Do you have DVD-A?), plug the analog outs of the DVD player into CD (or the multichannel inputs), and select CD (or multichannel) on the remote. Also, you may need to set a preference on your DVD player to output sound to the analog jacks. I'm on a little more shaky ground on that one, so I'll let someone else cover it.
