A few days ago a customer brought in a windows 10 computer that had a problem with the screen flashing after login. The screen would flash 20-30 times after login. It would behave normally until a window was opened or a menu accessed, and then the screen would flash 20-30 times again. I did a lot of searching and the only things that came up were issues with Norton on the 10 preview and video drivers. My customer's computer didn't have Norton, but I tried removing the anti-virus with no joy. I also tried uninstalling and reinstalling the video drivers to no avail. In desperation I tried creating a new user and that worked. I don't know what in her original profile was wrong, but it was clearly something there. If anyone has come across this issue and found a way to fix it without the hassle of moving profiles please speak up.
If you're in Waco, Tx G&A Computers can help you with all of your computer repair needs. PC, Mac, all computers repaired.