All About Linux: How to Repair a Corrupt MBR and Boot Into Linux

“There are times when you inadvertently overwrite your Master
Boot Record. The end result being that you are unable to boot into
Linux. This is especially true when you are dual booting between
windows and Linux OSes. Once when I was working in Windows XP, I
accidentally clicked the hibernate button instead of shutdown. And
windows somehow overwrote my MBR which housed the GRUB boot loader.
At such times, it pays to have this cool tip at hand.

“This is what you do to restore the GRUB boot loader when faced
with the above problem. First you need a Linux distribution CD. If
you are using Fedora (RedHat) then the first CD is sufficient. But
you may also use any of the live CDs like Knoppix, Ubuntu Live CD
and so on…”

Complete Story