1st gen Mac Pro graphics glitches and unresponsive

I'm not sure if this is related to
a) Snow Leopard
b) Safari 5
c) something else
but after recent updates I get graphics glitches, such as in Safari, lines across the browser window, not on particular content, it might be pure HTML (the old kind) and can be flash, or multimedia...
When using Final Cut (6) I get some weird graphics related errors from time to time, and after hours of editing suddenly my computer stops, becomes "frozen" (I have the clock in the menu bar set to show seconds and they stop) I have to do a hard-reboot to get anything back.
And the thing that happened now, which makes me post this thread is I was doing some web development, while watching some iTunes U movies, suddenly I had green graphical artifacts over the screen(s) and the computer froze.
Is anyone else out there experiencing this, perhaps found the source of the problem ?
My console reports 2 things that doesn't seem too "serious" TimeMachine finished doing a backup successfully and mDNSresponder got a "Bad DDNS browsing domain: (unknown)" just before the latest break down.

Sorry you're having this issue. It is a common issue and I have it as well. I ended up replacing my card which fixed the problem but, after 6 months, the problem is back.
There is something nasty with the Mac Pro's and graphic cards it seems. My first card was a NVIDIA GeForce 7300 GT and now I'm having trouble with the ATI Radeon HD 2600.
I'm trying to get to the bottom of the problem... no luck so far... I'm not interested in replacing the card if it's going to happen again 6 months down the road and I'm not interested in buying a new computer either.
Any luck with your problem?
Saki

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