Zorin OS 16 black screen with blinking cursor

Well, I wonder if adding nomodeset to grub is all you need. You may need a different Nvidia driver. But you must access the build in order to do either.
If you use the LiveUSB, you can mount the partition to update grub:
https://itectec.com/ubuntu/ubuntu-how-to-run-update-grub-from-a-livecd/

Following the above guide, before running sudo update-grub, you will need to run sudo nano /etc/defaul/grub
then add nomodeset behind "quiet splash" to make it "quiet splash nomodeset"
Then update-grub.

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I get failed to get canonical path of /cow on sudo update-grub

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That says it is trying to update-grub on the LiveUSB instead of on the mounted partition. Something went wrong.
Can you re-check your steps?

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I remounted everything and it says it worked, trying a restart

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Dang same screens, can't type anything from grub still

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Unless anyone else has any other suggestions... Since you are able to use the LiveUSB, I would run that to access your personal files and back them up if you have not already...
And suggest going ahead and reinstalling Zorin OS.

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Dang okay

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I have the same problem, I take a picture on my phone I can't send it here, but if I send it to my pc I can send it. This is weird AF

Maybe this is useful