Preview monitor suddenly stopped working and disappeared

In the middle of my edit, clips refused to play and my separate external preview monitor blinked back to the desktop.
Now, even after a restart, importing into a new project, reconnecting and disconnecting equipment, I can't get the second monitor option to reappear in my Playback settings window. Where did it go?

How is this Separate External Preview Monitor connected?
- Computer Monitor via Video Card?
- NTSC Monitor via MATROX, BlackMagic, AJA?
- Mental Telepathy?
Window > Source Monitor
(Shift +F2)
Sequence > Sequence Settings > Playback Settings:
- check/uncheck Desktop Video Display During Playback
- set External Device

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