I have the same issue. Running Windows 7 on Sierra 10.12.4 and Parallels 12.2. Have black screen on Windows with no way to force quit Windows. Quitting Parallels does not quit Windows. The solution from Windows forum requires Parallels to be running and Windows not running, no way to do that. I've tried several solutions recommended on various forums with no results. How can I force quit Windows (end process) when the screen is black?
This blog has the most details: http://blog.parallels.com/2015/09/29/how-to-fix-the-black-screen-in-windows/
but it only works if you can quit Windows and still run Parallels.
Last edited: Apr 22, 2017