Horizontal Lines During Video

I'm hearing lots of problems with horizontal lines and all on the 20" iMac. I'm having a similar problem, but different circumstances.
See, whenever I play video, including DVDs, files in Quicktime, and even footage in the Viewer in Final Cut Pro, there are strange horizontal lines that show whenever there's significant motion onscreen.
For example:
http://files.upl.silentwhisper.net/upload0/Picture_1-rxc.png (from a DVD)
http://files.upl.silentwhisper.net/upload0/Picture_3.png (DV video in Final Cut Pro)
(2 .png files there)
I've updated to 10.4.7, but the problem persists. Even my girlfriend is having the problem, and she bought a stock 20" from the Apple Store, whereas mine was ordered online.
One last thing - when I made a movie on her iMac recently, the lines even showed up on the DVD copy, when played on a DVD player. What's the deal? Anyone know?
Thanks in advance for any assistance.
~ Joseph
P.S. I posted this over in the iMac Display forum as well, but no one has replied to it - I brought it over here in the hopes that someone could answer my question.

Have your tried viewing it on other hardware, say another iMac or even gasp an IBM/PC compatible, or writing it to DVD to view on a consumer DVD player? Try this out to see if the horizontal lines appear on these as well.
I know it won't solve any problems, but at least you'll find out whether it's a problem with the iMac playing he video or a problem with the video files you are creating.
Actually, I think I'm going to try and dig out some of my old video stuff to see how that plays on my iMac. I'll report back if I expereince anything like you are.
Best of luck!

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