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Hey Jim, I just thought of one more thing. Does your motherboard have onboard graphics? It may be reverting to that. In bios you should be able to set a priority to disable onboard graphics if another card type is present. Usually a selection like AGP/PCI/Integrated. And combinations of available slots by priority. The machine will read from any available video with generic VGA drivers until windows gets to the boot loader so don't be scared to disable onboard graphics. You can always hook a monitor to the onboard to reset your bios.
The other thing I have had to do software wise is to boot in safe mode, uninstall all the video drivers and start from scratch letting my new ones be the only ones present. This happens sometimes when the old drivers just don't want to let go, or the uninstall is incomplete.
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