No Screen Output on MacBook after Zorin Installation

Wasn't sure where to post this so apologies if the wrong place - Just picked up a secondhand MacBook A1534 running macOS Monterey - Worked fine with macOS. Bought it to run Zorin - Have wipe the SSD and installed Zorin and now I can only use the MacBook with an external screen - The built in screen is black. When I boot to the EFI boot menu, it only offers the SSD to boot from - As this MacBook only has one USB-C connector, cannot have the external screen and a USB drive in at the same time so not sure how to solve this. Help! Any ideas how I recover the inbuilt screen?

Welcome to the Forum!

I have taken Your Comment and created an own Thread for it. So, we can concentrate on this. Some questions for the Beginning:

  • What Tool did You use for creating the Bootstick?
  • Did You checked the Checksum of the ISO?
  • Did You tried Zorin in Live Mode? If yes: Did that work?
  • What Graphics Card is built in?
  • Do You see a Login Screen?