A blank screen appears when you restart a computer that is running Windows Vista or Windows Server 2008 after you reinstall the driver for a graphics device
Assume that you have a computer that is running Windows Vista or Windows Server 2008. You uninstall the driver for a graphics device, restart the computer, and then reinstall the driver. When you restart the computer for the first time after the driver reinstallation, the startup process stops at a blank screen.
Note: This problem does not occur if you uninstall a driver and then reinstall the driver immediately without restarting the computer.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB972903.