I recently got a fresh win7 install on my desktop and after a couple days some extreme flickering and screen distortion appeared. I tried disabling and uninstalling certain drives, did rollbacks etc. the problem persists. Booted in safe mode and the screen didn't give me any trouble also during boot up everything is fine but the flickering goes on from the welcome screen. I have an onboard 4250 if that's relevant.
here's some pictures to give you an idea of the problem
here's some pictures to give you an idea of the problem