For some reason my Windows screen is black when launched from Parallels. This seems to be a result of the computer running out of battery power. When I plugged the MacBook Pro back in to power and accessed Parallels the screen was black. I have restarted and rebooted the computer, which have not corrected the issue. I using Windows 10 on Sierra 10.12
Hi DaleY, Try to reset the VM or stop the VM, use the option Actions > Reset or Actions > Stop then check.