Black screen after installing nvidia drivers

Support Graphics & Display
44

may be recheck something for linux ( save profile for windows )

UEFI [Legacy]: is not good

you can add under chroot

manjaro-chroot -a
pacman -mirrors -c all 
pacman -Syy ( check internet )
mhwd-kernel i linux419
mhwd-kernel i linux510
exit

then reboot press Esc on boot to see Grub > advanced select other kernel