preupgrade grub2 failed: now can't boot

[sean darcy]

preupgrade failed for some reason to install the grub2 bootloader. 
/boot/grub2 exists.

I made an F16 livecd. edited /boot/grub/grub.conf:

default=0
timeout=2
title 3.2.2
    kernel /vmlinuz-3.2.2-1.fc16.x86_64 
root=UUID=017cd53d-21ae-43b5-b8ce-b23b15092273 ro rd.md=0 rd.lvm=0 
rd.dm=0  KEYTABLE=us quiet SYSFONT=latarcyrheb-sun16 rhgb rd.luks=0 
LANG=en_US.UTF-8
    initrd /initramfs-3.2.2-1.fc16.x86_64.img

all taken from grub2/grub.cfg.

It booted, but then died with a dracut prompt - and I had no clue what 
to do then.

Running grub2-install from the livecd doesn't work. Ubuntu seems to have 
a tool "boot-repair" on their livecd, but I can't find anything like 
that on Fedora.

So,

How do I boot the using grub - so I can run grub2-install natively?

OR how do I install grub2 from the livecd - or otherwise?

sean