IMac CD with mini-DVI - Video adapter woes

I bought a mini-DVI to video adapter when I first got my iMac Core Duo. I never used it, and so a few weeks ago I was distressed to find out that it didn't work. So I ordered another, assuming the cable was the problem. Nope -- this one has the same trouble.
The problem is that the display is distorted and "rolls" occasionally like the V-Hold is off. There are also two black "bumps" or places where there are waves in the display, one on each side of the TV's tube. The TV itself is a little 20" Orion -- not too new, but not too old either.
* The TV should be fine, since I've used it with a mini-VGA to Video adapter with my previous Mac, an iBook G4.
* The cables should be fine, because I've switched them all out and tried different ones.
* The adapter should be fine, since I ordered another cable and it displays the same thing.
* The computer should be fine, since I can output to an LCD monitor with my mini-DVI -> VGA just fine and dandy.
So does anyone have an idea of what the problem might be? I'm really perplexed, and I don't think I'm missing anything obvious. Like I said, I've used a couple of similar cables before without problems, my iMac is otherwise flawless, and so on.

I reinstalled the OS to see if that solved the problem. It didn't.
I tried to get an appointment with an Apple Genius, but apparently the Concierge was experiencing a large amount of traffic and could not help me. I don't really understand if I'll be charged for calling tech support (I'm out of the 90-day period, but obviously not out of warranty), so I don't particularly want to drop any money for support on a computer that apparently arrived lacking a significant feature. Unless I'm greatly mistaken, that's also known as DOA...

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