Seeking Help Diagnosing Problem

Hello, I have been having some trouble with my video card, and I was hoping that someone here might be able to give me some advice in diagnosing (or outright fixing this problem).

First, a description of the problem itself:

I was playing Dark Age of Camelot when the problem first manifested. I crossed a zone boundary (which causes the game to load a new area) and when the loading screen disappeared, the game screen was covered with a multitude of geometric shapes of a variety of colors and patterns. It only seemed to be a display issue, however, as I was still able to control my character, the music was still playing, and so on. At this point I decided I should reboot my computer, so I began to quit the game. When I left the game world and returned to the character select screen, my monitor went blank, and after a few seconds my monitor's status light turned amber. Next I rebooted the computer (I believe by using Ctrl-Alt-Delete, but I may have used the reset button). When the Windows loading screen appeared, there were blue lines at regular intervals across the screen. And when Windows itself appeared, it also had small lines across the screen. At that point, when I tried to run DAoC, it would quit with a "Render Creation Failed" message, and dxdiag couldn't detect Direct3D.

Here are the specs of my computer:

ASUS A7N266-C Motherboard
340W Power Supply
AMD Athlon XP 2100+
PNY GeForce 4 Ti 4600 128 MB
2 512MB DDR PC2100 RAM
80GB IDE Hard Drive
SoundBlaster Audigy
Windows XP Professional

I talked to the company I purchased my computer from, and they decided it was a problem with my video card and sent me a replacement. When I installed the replacement card, it was having the exact same problem.

For reference, I made two screenshots that illustrate the problem (the first is the old card and the second is the new card):
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In addition to getting the replacement card, I have also tried both the Detonator 30 and Detonator 40 drivers, flashed my motherboard's BIOS, and reinstalled Windows. I also tried both cards in an older computer, and the problem manifested there.

At this point, I am unsure what the problem could be and what to do next. Anyone have any thoughts?
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  1. The same problem happend with BOTH 4600's in a differnt computers, thats odd?
    Well first thing i usually do here format the computer and reinstal everything with the latests drivers ect. If the problem happens again try a 3rd videocard if you have one.
    I suppose it might be the motherboard or something but ive never heard of that happening before, thats usually a bad videocard problem there. Perhaps they sent you a bad replacement? were the errors exactly the same with both cards?

    Sex is like a card game, if you dont have a good partner you better have a good hand.
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