There are two possible reasons why you can’t boot into Zorin desktop:
- Graphics drivers not loading (even though Try Zorin will work, some times the graphics drivers don’t load post installation as you can see in that very first link I cited).
- Windows blocking Zorin boot
The first method I cited (Aravisian’s suggestions) is based on assumption #1. sudo ubuntu-drivers autoinstall in a terminal will address that. Are you able to get to a terminal at least with ctrl+alt+F3 (or anything from F1-F6)? That is also a way to fire up the terminal when the system boots but the desktop is not loading.
If it is #2 then there is no need to try ctrl+alt+F3 since Win 10 already blocked Zorin from booting. I have also heard of “Fast Startup” in Windows 10 (#4 listed here) that can cause issues. Thanks for the information on the the bitlocker block - seems like another installation block option from Win 10. The only recommendation I can make here is to try and learn if there are more ways for Win 10 to block Zorin. Unfortunately, I don’t use Win 10 on any of my machines (except my work machine and I can’t experiment on that) to be able to provide any effective troubleshooting of a Win 10 issue.