If you experience a black or blank screen on your Windows device, try the following:
To wake the screen, use one of the following keyboard shortcuts: Windows logo key + P or Ctrl + Alt + Del.
For a black screen, use the following keyboard shortcut: Windows logo key + Ctrl + Shift + B.
For more info, see Troubleshoot black screen or blank screen errors.
If you have a Surface, see Surface won’t turn on or wake from sleep.