Hi, enbylyn!
Welcome to community!
It will be much more clear if you expand those couple words into a detailed and definite description, making more users to understand the issue you meet and to be able to support your case.
As for me I completely didn’t understand what, under which circumstances, after which your actions are hangs up.
Which ISO name did you use to install Manjaro OS copy?
Did you check a hash sum after an ISO image file download to greatly reduce a chance of getting damaged file during download?
Also, does a terminal sessions Ctrl+Alt+<any number from 1 to 7> works (changes the picture on the display) after hangs?
If you did not setup many many settings already, may be mean time to try a fresh (today’s) ISOs (Manjaro 21.1.3 Pahvo released!)?