After installing Windows 7, you may experience an issue in which the screen(s) becomes completely blank directly after startup. This problem primarily affects multiple-monitor setups.
Fix In order to fix this issue, you first need to regain access to onscreen display. You can do this by either booting in safe mode (tap the F8 key on your keyboard repeatedly as the computer is starting up) or by temporarily disconnecting all but one of your monitors.
After you have started up and have access to your display, you will need to create a .bat file that kills the dwm process at startup. Follow these steps.
- Launch the Notepad application and create a new text document
- Type the following text into the document: taskkill /F /IM dwm.exe
- Save the file as displayfix.bat
- Copy this file to C:/ProgramData/Microsoft/Windows/Start Menu/Programs/Startup
After you restart, Windows Aero may be disabled. To turn Aero back on, right-click on the desktop and select “Troubleshoot problems with transparency and other Aero effects” then enable Aero.