My Father was watching a video and since then the only thing on his laptop is a black screen with a white cursor. Pressing control alt delete brings you to the usual screen where you have options to start task manager, restart/shut down the computer. Starting the task manager simply brings you back to the black screen with the white cursor. Selecting to restart or shut down the computer will briefly show the desktop while it's either shutting down or restarting. Which leads me to believe that the black screen is something running, possibly related to the video that he was watching, that won't release 'focus' for lack of a better word.
I've tried starting the laptop in safe mode and it successfully starts in safe mode with or without networking, but immediately shuts itself down. I haven't tried safe mode with command prompt.