I am trying to install Boot Camp on my (2013) nMP using an OEM copy of W8.1. I get almost all the way through Windows installation and setup, but everytime I get a black screen when the screen says it is installing apps. The screen cycles between turning off and on with a black screen. Sometimes the cursor displays and I can move it around. I never get to the Boot Camp install of the Windows support files. I have to do a hard shutdown and then reboot. I can then boot into Windows and things seem fine. When I run the Boot Camp installer it goes through the process of installing drivers but hangs when it gets to ATI Graphics and I get the black screen again. Seems pretty likely the issue is with the graphics driver/software. Ive seen a lot of older reports of similar issues, but couldnt find a solution that applied to my nMP. Anybody have any advice or things I might try? Or do I just need to wait for Apple to issue an update? I havent contacted support yet but I might give that a try.