For Anyone in Future, who will look for help in Google, and hop in here.
Solution is, You can't have 1:1 ratio for Screen, the Screen need to be pulled out a bit, or Zoomed in ( thus some menus in games might be out of your visible zone ) only That way it stops Blinking - ( it can be set in Nvidia Control Panel - normaly is on Auto - sometimes its good to check if flashing starts - mine need to be different from auto ) - that is why the black photo stops blinking - when making zoomed in, some pixels are out of view, so it stops blinking too.