New install - black screen - dual boot Windows 10

The first sounds plausible. To the second question - yes:
https://www.howtogeek.com/114884/how-to-repair-grub2-when-ubuntu-wont-boot/

Hi - I have now followed those instructions, but that also does not seem to have worked - it still does not boot Zorin. I tried following the instructions twice, and each time this was the feedback from the boot repair utility:

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