The drivers for my sapphire 7790 2gb OC have completely flopped. My screen is really dark compared to what it was a few hours ago. I've tried the usual 'Re-install' a fair few times. It's come to this, I need to know how to fix it. When I load up cs:go its so dull, I can't even change the brightness in game and my monitors brightness doesnt help at all. It's never done this until now, I'm on Windows 7. Someone please help me, thanks.