I have had a Panasonic PT-47WX53 rear projection HDTV for about four years now, and all has seemed fine up until this past week when I got a PS3 for Christmas. I only have DVI for a digital input on the TV. I had bought a $100 DVI-to-DVI cable about a year or so ago, to use with a Hi-Def cable-box at the time. However, my cable-service provider told me that they had not enabled the use of that output on their boxes, but I kept the cable anyhow in the hopes that that would change. It didn't.
Anyhow, somewhere in between then and now I also picked up a $20 DVI to HDMI adapter end for my expensive cable, to update it (as everything is now all HDMI, including the PS3) so I wouldn't simply LOSE the hundred bucks I had invested in it.
So when I got the PS3 last week, I set all the settings on both it and the TV (correctly, because I get picture and sound) for using the digital DVI cable with the HDMI adapter.
The problem is, after trying out a few Blu-Ray movies, I noticed a few horizontal "ghost" bars scrolling up my screen. They are not as noticeable when there is a bright image pictured on the screen (which is probably why I did not see them at first) but whenever the screen is predominantly darker, these bars are obnoxiously present. I checked some of the other inputs on the TV (antenna, component, etc.) and I DO notice a similar but far more faint image that I would almost never have seen if I had not been looking for it.
My question is threefold:

1. Is this a form of electromagnetic interference?
2. If not, then what is it?
and
3. How do I fix it (cuz it's bugging the crap out of me)?