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Place the bootable image into your machine appropriate drive and reboot the machine. On the first step, download the latest version of CentOS 7 ISO image and burn it to a DVD or create a bootable USB stick. If from some reason the first 448 bytes are overwritten, the CentOS or Red Hat Enterprise Linux cannot be loaded unless you boot the machine with a CentOS ISO image in rescue mode or using other boot loading methods and reinstall the MBR GRUB boot loader.
#GRUB RESCUE MODE REMOVE GRUB WINDOWS 10 HOW TO#
Read Also: How to Rescue, Repair and Recover Grub Boot Loader in Ubuntu The Grub boot loader stage one is installed on the first 448 bytes at the beginning of every hard disk, in an area typically known as the Master Boot Record ( MBR).
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A corrupted Grub boot loader makes a CentOS/RHEL system unable to boot and transfer the control further to Linux kernel. The GRUB boot loader can sometimes be damaged, compromised or deleted in CentOS due to various issues, such as hardware or software related failures or sometimes can be replaced by other operating systems, in case of dual-booting. In this tutorial we’ll cover the process of rescuing a corrupted boot loader in CentOS 7 or Red Hat Enterprise Linux 7 and recover the a forgotten root password.