I would test the PSU rails first, then check for your Monitor .inf for an update,(tho I doubt thats it). Again, could be a bad cell on the Vid memory.
May want to do a complete Uninstall of the card, and remove all the old ATI references with Drive Cleaner in Safe mode if you hadn't allready.
I had a similar thing happen with a PowerColor 3870, and eventually figured out it was bad memory on the card and RMA'd it.
Larry
edit; You may want to check your Cables for a good connection on both ends, as well as Re-seating the vid card.




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