Graphic corruption, motherboard causing it?

Hello all, I have a MSI K8T-Neo FISR2R KT800 motherboard with a amd64 3.0+ Ghz CPU, Gainward GF6800GT and SB Audigy. The problem started about 1-2 months ago when suddenly small parts of my screen on the desktop went corrupted momentarly. However, this didnt occur too often and I didnt give it much attention.
Anyhow, about 3 days ago the problem reached its climax. The corruption showed itself in several games wich would result in a freeze and eventually, a reboot. My first thought was that it was OS related, so I reformated my harddrive and installed the latest drivers in hope to get rid of this problem. Right now the problem is that when I run games or certain applications, the screen is black (although the monitor does not go to powersave mode) while the program/game runs normally. The video output has gone away, so to say. Also some winamp visualizations are rendered as black or corrupted. I changed the videocard to a GForce FX 5200 and the same problems remains.
However, If i change the rendering device in unreal tournament 2004 to openGL, then the game runs normally. My directX is 9.0c. What could be wrong here? I dont have anything OC'ed, and I have excellent cooling on both my CPU and GPU. my PSU gives 400W and thats more than enough i belive (if it was a power related issue, then the problems would have ceased with FX 5200 since it dosent require a power wire attached to it).
Could it be the motherboard that has gone bad? in that case, why can it render some graphics and some not at all?
TIA

Quote from: Tiresmoke on 28-November-05, 01:02:43
Hmmm never saw one do that yet. Power? Yes it could be but I don't think so in this case where the second vid card that uses less power does the same. Motherboard? I would not think that it can selectively corrupt just a certain section of the screen. The Motherboard does not create a screen matrix. It sends stuff to the video card more in line with a stream of data over several pipelines. While that is an oversimplification it gets you to visualize how it works.
There is one more device in the chain though that could mess up consistantly at the matrix level and that is the monitor. I think I would considure that before I would the MB.
Just my humble opinion
that sounds like a unlikely cause, considering the freeze i mentioned earlier but i did however try with another monitor, and the problem remained.
Lets see... if both the GPU's are fine, the mobo seem to be unlikely to be defect, and no recent BIOS changes has been done, what else could be the cause? I think it could be the software but since this is a fresh install and I shoved in new drivers and all...
Still it dosent explain how those small graphic corruptions on the desktop escalated to complete freezes and eventually a complete black screen... 

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