Fix grub with Fedora Live CD

Here are some more LiveCD methods that should work (just for the
record). I tested the following examples using a Fedora 10 LiveCD to
re-install GRUB in the master boot record of /dev/sda. Boot with the
LiveCD, and open a terminal, get root privileges with su -

, and then...

When the busted system is in a single ext3 root partition (say, /dev/sda5)...

mkdir /mnt/temp
mount /dev/sda5 /mnt/temp
grub-install --root-directory=/mnt/temp /dev/sda

When the busted system has separate ext3 boot and root partitions (say, /dev/sda5 and /dev/sda6)...

mkdir -p /mnt/temp/boot
mount /dev/sda5 /mnt/temp/boot
mount /dev/sda6 /mnt/temp
grub-install --root-directory=/mnt/temp /dev/sda

When
the busted system has a separate ext3 boot partition (say, /dev/sda5),
and the root partition is a logical volume (say,
/dev/VolGroup00/LogVol00 according to lvdisplay)...

mkdir -p /mnt/temp/boot
vgchange -a y
lvdisplay
mount /dev/sda5 /mnt/temp/boot
mount /dev/VolGroup00/LogVol00 /mnt/temp
grub-install --root-directory=/mnt/temp /dev/sda

If
grub-install fails with a read error or the boot loader still doesn't
work, always try the GRUB shell (and vice versa). They both accomplish
the same thing, but different things occur in the background. It's not
necessary to mount partitions when using the GRUB shell commands in the
LiveCD. Change x & y in the example to the busted system's boot
partition...

/sbin/grub
grub>
root (hdx,y)
grub>
setup (hd0)