Originally posted by Pausen:

Same here I sure its not a hardware problem
the last hotfix did somesthing with the resolution settings since than its busted

As the only possible resolution i have now
1920x1080 64hz

I have no idea why 64hz since i selected after the installation 120Hz

I think the last hotfix was a month ago? Let's not confuse the issue op is having. Probably best to start your own post for your issue.