In my case if that happens, I use alt+f4 or ctrl+shift+esc and wait. It usually pulls up the "TLOPO has stopped working" window if I wait long enough. Otherwise I wonder if you could use alt+tab to the desktop? Or Windows key+L to lock your computer. Then when you log back in it might give you more control.
I haven't had too many black screen issues but if I did, the above usually helped me with a little bit of patience. But in my case I've always been able to see the task bar and game window so if your issue is a completely black screen, that might be an issue unique to you