Re-install Grub in MBR

All the problems I have had recently meant that the MBR also got corrupted and therefore Grub hung. I fixed it by booting from a live CD and opening a terminal. Then typing:
sudo grub This will give you a grub prompt
grub> find /boot/grub/stage1
grub> root (hd0,0) or whichever partition has the grub files, here first partition on first drive.
grub> setup (hd0)
grub> quit (hd0)

That’s it, Grub will be installed on the first hard drive.