Any ideas?
Are you using Nvidia Graphics Card? If so, you may need to try with nomodeset.
From the Zorin OS Boot Menu, tap the e key or the tab key to enter the EDITOR mode for the Live USB grub.
Once in, scan the page looking for quiet splash. Once you find it, One Space after splash add nouveau.setmode=0 so that it looks like quiet splash nouveau.setmode=0
Then exit the Grub editor and proceed to boot.
You may try nomodeset instead as quiet splash nomodeset
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