Grub boots and lets me choose an operating system but then I can’t do anything, straight up black screen, my second monitor is working and my keyboard lights up.
have you done an update ?
I did grub update before restart
boot on USB iso manjaro
open a terminal
inxi -Fxza --no-host
sudo parted -l
sudo efibootmgr -v
test -d /sys/firmware/efi && echo efi || echo bios
Do you remember the exact syntax you used?
I did these steps:
$ sudo nano /etc/default/grub
Alter the GRUB_CMDLINE_LINUX line:
GRUB_CMDLINE_LINUX=“nouveau.modeset=0”
Once you have made the change update GRUB:
$ sudo update-grub also, I use grub since bootmgr was missing and I had no way of fixing it.
Did it, still black screen
Will you leave us in the dark? 
Soo… I fixed it by going in to E while being in the Manjaro option in grub and removed the thing that turned off the drivers
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