Cracked Macbook Pro screen can't get external monitor after booting Sierra.

I have a 2013 Macbook pro Retina with a completely unusable cracked screen. I was using an external monitor with El Capitan but when I updated to Sierra I can't get an external monitor to work and don't know what to do since I can't see what to put in next. I tried my Apple login and that didn't work. I tried Command F1 and that didn't work. Any help would be great!

MacBook Pro with Retina display, macOS Sierra (10.12.6), Not sure which Sierra version it is

Posted on Apr 3, 2018 8:13 PM

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Cracked Macbook Pro screen can't get external monitor after booting Sierra.

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