Screen Grunge (corruption)

I get intermittent "screen grunge" on start-up that stays on the screen until I do a cold boot. Most times this will clear up the screen and I can go and use the computer for weeks until, out of the blue: screen grunge.
The corrupted screen displays itself in a definite, orderly pattern (see screen shots below); however, if I move my cursor around, the neat little blocks of corrupted pixels shift and move until the screen is a huge mess.
I'm running 10.4.10, my graphics card is the ATI Radeon 9800 Pro.
I've reseated the card; the fan on the card is working. I've run diagnostic tests and the RAM and video memory checks out fine.
Although this symptom has showed infrequently, it has just happened twice in successive days, so I'd like to find out what's wrong. I'm thinking something in the BIOS or motherboard, but don't know what.
Here are the screen shots:
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I have copied this from another thread, as it might help some folk:
I have a AGP Ati X800 card (retail )that worked great for a long time then suddenly it began to give trouble creating blocks on the screen or pixels everywhere - ( normally associated with a bad video card ) well I found it was not my card but my card was overheating! AFTER i updated from 10.4.10 to 10.4.11 - Every time the computer would sleep or display would go down i got blocks - I checked the G5 AGP card with computer open and sure enough the card was almost smoking and the fan was not on -BUT the fan would always start up with startup . - In 10.4.11 I did try and update ATI drivers, but it did not fix it either. So I tried Leopard 10.5.0 - 10.5.1 (fresh install)- SAME problem - and it hangs often. SO now I installed 10.4.0 Tiger and the upgrade to 10.4.10 and No more problems with my video card. Fan runs normally again.
note: I was very careful not to let my card really overheat too much when the screen would start to block before I always estimated it was something to do with the cooling so I Shutdown and let the machine cool off before trying another test.
SO now I am stuck with 10.4.10 as my last upgrade possibility until APPLE fixes this issue. So don't think it may be only your ATI video cards just going bad it seems to be software driver related - of course if you let your computer fry the card then yes it will be ruined. Remember there has been issues with ATI cards even in the new iMACs, which we have at work - but the latest update seemed to fix the issue there, yet perhaps it messed up legacy cards like the X800 AGP retail card -

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