OK, this is one cause for flickering screens after a Windows 10 upgrade. It may be the only one, I don’t know..
The cause? Norton.. 🙂 See here..
No, I don’t like Norton or Symantec Anything, but I don’t like any of the other big anti-virus suites either. I have tried them all, and just as I think I have found a good one, the software author trashes it.
Anti-virus programs weren’t always this way. There was a time when nobody really knew if they did anything at all. All we could do was believe what we were told. One thing is for sure, they were supposed to work seamlessly in the background.
They don’t do that anymore. Every now and again, the computer stops doing something that has not been an issue before, and invariably it is the huge anti-virus suite spoiling the party.
Best plan is to use the Microsoft offering. It works seamlessly, never stopping anything that is harmless, and you never get a virus infection because I suspect there is nothing for Windows Defender to stop. ‘Virus infections’ these days refers to popups et al, invited in by the user, not let in by your anti-virus suite.