When i boot into manjaro (fresh install) i see /dev/sda5: clean, 244000/16384000 files, 1989978/6553600 blocks using the nonfree drivers than it blinks and shows the same text but with the free drivers and than a black screen.
You need boot into a Manjaro LIVE ISO on USB to fix your system with the command
sudo manjaro-chroot [mount with your system partition]
Password: manjaro
Then you can fix the system what you know or you can uninstall the nonfree drivers.