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thank you for your idea - but in my case, this can not be a solution: First, the display controller is the virtual controller from Parallels, Second, I do not hear a Windows beep. But in-between, I found out, that when I move the mouse cursor (which is visible always) to the top of the black...

After having installed Windows 10 unter Parallels 10.2.2 I found, that everything is working correctly. Only when I shut down Windows 10 (also Parallels is shoot down, I can not restart Windows 10 - I only get a black screen.