i have the same white screen bug like a lot of others here and i have a ATI Raedon 6950.
BUT i doesn't help turning AA off and switching to multisample in the CCC Tools.
Have you deleted your Prefs and updated your video drivers?
Yes, i updated the drivers, even to the AMD Beta driver, i rolled back to older ones. nothing helped...
Can you try verifying the game cache through Steam?
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