I upgraded from Windows 7 Home Premium to Windows 8.1 Pro about a week ago. Everything seems fine, unless I leave the computer idle for a long time. What happens is I get a black screen, *with no cursor*, when I return to the computer after leaving it idle overnight. It is not asleep. It is also not frozen. I can tell because I am able to reboot it while it's like this by:
Press: WIN+R
Type:...
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