Black screen with crossed circle after attempting to fix iMessage

Hi guys,

My Sierra install went super smoothly, everything was working (ethernet, audio, drivers) and then I followed the guide in the sidebar to fix iMessage, and now upon rebooting I am just getting the black screen with a crossed out circle. Does anybody know how to fix this or undo what I did?

  • i7-7700k
  • AsRock z270 killer sli/ac
  • GTX 1060 6GB
submitted by /u/stitchmark
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