Tektronix Prism -- How to Repair Grub / Boot Up Errors


1.) Make a Linux / Centos 7 USB Boot Disk -- Can be a full DVD or just rescue

2.) Boot to terminal -- or boot to Anaconda Rescue mode -- doesn't really matter which.

3.) Issue the following commands --


chroot /mnt/sysimage

mount -rw /dev/sda1 /mnt

cd /mnt/EFI

efibootmgr --create --label Centos --disk /dev/sda1 --loader "\EFI\centos\grubx64.efi"

sudo cp -p centos/grubx64.efi Boot  (Make sure this is the Boot folder inside the EFI parition you mounted!)

sudo touch centos/grubx64.efi.gbr

exit

init 6

4.) After this the scope should be reboot and you should be home free.