Re: Video card issue
This is my theory.
The video card is using its resources and all of its bells and whistles. This is possibly making the video card heat up to much(possible fan not spinning). A video card over heating can give you the types of display problems you are describing.
Driver not installed.
The generic drivers are not pushing the video card. Generic drivers are only made to get the general purpose of giving an output to the display, so the user can be able to visually install drivers and troubleshoot. So its not using all of the resources nor much of anything else. This means it runs cooler.
This is my theory, I could be way off your actual problem.
It could be a ton of other things. If I'm you, I am going to be looking at the cards physical seating in the slot, Heat Issues, and driver issues.
Sounds like you already knocked out the driver issues.
Also check and make sure that there is not a power cord that needs to be hooked up to the card. I know most 4670's don't need supplement power but I don't know them all, so just double check.
Minesweeper Consultant / Solitaire Expert