Logged in remotely using RDP. To my surprise, my RDP screen was black.  Tried to disconnect and connect a few times with no luck. I remembered I used some combination of CTRL+ALT+? before. Googled and found it was CTRL+ALT+END.  This brought back the screen we would normally see when we press CTRL+ALT+DELETE in local machine. I chose Task Manager, and had my screen back.