to rerun grub after making changes to this
> file
> # NOTICE: You have a /boot partition. This means that
> # all kernel and initrd paths are relative to /boot/, eg.
> # root (hd1,0)
> # kernel /vmlinuz-version ro root=/dev/hdc5
> # initrd /initrd-version.img
> #boot=/dev/hda
> default=0
> timeout=10
> ;splashimage=(hd1,0)/grub/splash.xpm.gz
> title Red Hat Linux (2.4.20-8)
> root (hd1,0)
> kernel /vmlinuz-2.4.20-8 ro root=LABEL=/ hdd=ide-scsi
> initrd /initrd-2.4.20-8.img
> title DOS
> rootnoverify (hd0,0)
> chainloader +1
>
> --- end grub.conf ---

--
Have you tried reinstalling grub? grub-install re-writes the MBR to the
drive. OTOH, I'm not sure you can use semicolons to comment stuff in
grub.conf..?

cya,
Eric