Here's the way I've done it a couple of times recently for people; if
you have Fedora CD #1, and your system will boot from it, this is
probably the easiest way to reinstall grub's MBR:
Boot off Fedora CD #1 in rescue mode (what's rescue mode? Try hitting
the F-keys listed at the boot prompt, and see what you get). Choose
keyboard layout according to taste, don't bother setting up networking,
and tell it to mount your fedora install *read-write* (grub-install
wants to write stuff to places other than the MBR, and gets unhappy if
it can't because you mounted read-only).
At the rescue shell prompt, type:
chroot /mnt/sysimage # to give you a chrooted shell, so grub
# thinks your system booted normally
/sbin/grub-install /dev/hda # install grub on /dev/hda
# (change /dev/hda if you need to)
ctrl-D # to exit your chrooted shell
ctrl-D # again, to exit rescue shell,
# unmount and reboot.
Sorted. NB: the above is from memory, but should be good.
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