We start by finding details on the issue. For starters, please boot the live environment (USB) and paste your system details to the thread.
Next, when you get to GRUB before booting Manjaro, press “e” on your keyboard. Find the line that starts with linux, and delete the arguments quiet and splash if present. Press Ctrl + X to boot, and you should get a bunch of logs. If anything sticks out to you, write it down. If not, phone pictures aren’t ideal, but such is. Make sure all the text is clear.
It is late here so I’m going to go to bed, someone else will probably come in to help. If not, I will try to do some more in the morning.