The first 7400 I saw in the showroom was almost too hot to touch and it was sitting idle. I have had zero problems with my 8300 so far *knocks on wood*. In fact, none of my Marantz receivers/amps have ever had a problem - 2x SR4000, SR6200, PM7000, MA500. I DID have a problem with a CD player...
Try optical and analog, if you still have the problem there may be something wrong with the player, but it sounds like the cable is the problem. Using a video cable should tell you right away as well.