I got it!!! Adam & Kai..Thank you! Could not have done it without your help...I wish I could buy you guys a few beers right now.
You guys got me on track with the RCA cable and I got the onscreen menu going but could not access it...I them hooked up my Harmon remote online and customized the buttons, which I did not even know I could do. Once I got in, it was a snap...changed the TV to Digital 1 and the DVD player to Digital 2 and bam...everything is coming out of tha Marantz again, and sounding great. And everything being controlled by the Harmony remote.
Thanks again guys...seriously, I was going a bit nuts until you got me on the right track.