If you can't get into Task Manager via Ctrl\Shift \Esc , or Ctrl \ Alt \ Del then you'll have to press the reset button. If you can get into Task Manager you can end the Application that has crashed.
Nothing wrong in doing a hard re-boot. That's why the button is there. Sometimes you just gotta do what....
The worst that can happen is you loose unsaved data from an application you had open at the time of the crash.
When you re-boot Windows will give you alternatives to launching Windows normally, but for a one-off I would just go for a normal launch.
Black screen crashes are a common thing and can be caused by many things.
What were you doing at the time ?
btw - Double posting is naughty - Kenny ....