GRUB/Restore the GRUB Bootloader - Manjaro
wiki.manjaro.org › Restore_the_GRUB_BootloaderIn order to load the operating system, a Linux-capable boot loader such as GRUB, rEFInd or Syslinux needs to be installed to the Master Boot Record (MBR) or the GUID Partition Table (GPT) of the media containing the Operating System. Installations created using Manjaro ISO defaults to GRUB. For various reasons - it happens the bootloader get's corrupted, erased or misconfigured resulting to a black screen with a failure message during boot, like No boot loaders found in /dev/....
UEFI - Install Guide - Manjaro
https://wiki.manjaro.org/index.php?title=UEFI_-_Install_GuideTo use the Graphical Installer select the Install Manjaro option from the Manjaro Welcome screen or from the desktop.. For the ESP (EFI system partition) which will store the EFI Grub binary, a 512mb partition of type fat32 can be created in the partitioning step, and mounted to /boot/efi. If you are dual booting then an EFI partition from a previous install can also be used.