I have a Toshiba CZ32V61 TV hooked up (via component video) to a Panasonic A120 DVD Player and I am getting what can best be described as a burn mark or "hot-spot" in the upper left corner area of the screen. It looks like a yellow circle and doesn't seem to appear when using other sources (i.e. cable, vcr). I know I need to narrow this down a bit to verify if the problem lies with the TV or the Player, but any immediate ideas out there???

What does it look like via S-Video or composite cable?

Thanks for the reply..
I hooked it up to a different TV via composite cable and got a similar effect. The problem is that it isn't totally consistent as to WHEN it occurs. Usually it is after the movie has been running for awhile, but I can just about reproduce it every time in Saving Private Ryan at around the final bridge battle scene. It also looks a little different each time so it's tough to troubleshoot.

A Panasonic rep just told me it might have something to do with my VCR, which if hooked up anywhere in the system can send a signal that will interfere with the DVD, regardless the VCR's power state. That seems pretty ridiculous - as if I was getting a Macrovision interference! My VCR is switched through the Receiver so I don't see how that would be related to the DVD, but I will unplug it just to see....

Try unplugging everything from the TV -- everything -- except the DVD player. This is pretty odd; I'd try the player on another TV if possible.