I'm a Dell XPS user with nvidia GT 525M with Optimus. When I installed nvidia I was greeted with blank screen. And the error in nvidia log was "Fatal error : No screen found". So after searching for the solutions I figured that I have to insert "BusID" in xorg.conf file. After rebooting I was again greeted with blank screen with error "Fatal error : screen already occupied".

I don't what exactly the problem is. Do I need to blacklist Intel inbuilt graphics to nvidia in my machine or anything else needs to be done? Please guide me.