I have tried to make sense of what others have posted and relate it to my situation but I am still somewhat confused because I have not found the same exact issue I have. I have tried a number of config settings but no joy. I am running W7 Ult 64bit OS and have a Nvidia Quadro NVS 285... I am not sure how long this has been occurring (possibly since OS install) but every time I bootup and then login with my password, the screen flashes black for 2-3 seconds after the initial login. If I log off and log on with my pswd, it does not always flash. I have the most current driver for the Nvidia card. Is this a typical W7 glitch?