How to re-install GRUB bootloader on the Master Boot Record(MBR) in rescue mode

Solution Verified - Updated 2020-10-19T16:24:21+00:00 -

Issue

I had to restore my system and data partitions from tape after a crash. Why does my Red Hat Enterprise Linux system only shows a black screen after POST?
Why does my Red Hat Enterprise Linux 6 system drops to GRUB rescue prompt on boot?
How to reinstall grub2 into the MBR on Red Hat Enterprise Linux 7
I re-installed Windows on my server and now I can no longer boot to Red Hat Enterprise Linux.
On attempting to re-install grub I get the following error "Error 5: Partition table invalid or corrupt"
When I do grub-install I get error as "Error 12: Invalid device requested"

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