Firstly, please check your BIOS for settings like Secure Boot and "fast boot" and disable them. Also look for SATA mode / operation and set it o AHCI if it's in RAID.
If that doesn't work, boot from your Zorin installer USB and "try" the system, then run the Boot Repair tool from the start menu. Post the exact output of this tool verbatim if it gives an error of any kind.