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Sierra no longer booting. Getting 'Reboot and select proper boot device' message out of the blue.

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Joined
Apr 23, 2017
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4
Motherboard
GA-Z270N-WIFI
CPU
Core i3 6100
Graphics
GTX-670
I've been dual booting, jumping back and forth between windows 10 and mac os sierra for a few days now with no issues. It was glorious. However, while attempting to switch back to mac, I'm suddenly getting a 'Reboot and select proper boot device' message. I'm getting the same message when trying to boot from my Unibeast USB.

I've found a couple of people reporting a similar issue, but no replies. Please help!
 
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