System failure during yum update - lost grub.lst

[rgm at htt-consult.com]

At least grub.lst, as we had a kernel update yesterday....

I am accessing my mail via SquirrelMail vai a borrowed Ubuntu USB boot
drive (I will have to build and carry a FC12 USB boot now) so email is
difficult compared to my Thunderbird setup....

Last night during a yum update that included a new kernel, my system did a
poweroff.  I am suspecting a CPU temp shutdown.  I am upset that such an
event does not put me in suspend mode but that is a separate message. 
Anyway when I powered up I was at the grub> prompt, and I don't know what
to do from there.

This morning a colleague (I am at the IEEE 802.11/15 meeting in LA) lent
me his Ubuntu boot USB drive so I could at least get on the session web
site and such.  I was also able to see my /boot partition and observed
that /boot/grub/grub.lst is ZERO bytes.  This seems really bad, as it
would have my partition mount information to get to the / and /home
partitions in the LVM partition.  Can I find this information still?  Is
there a way to find the file so I can manually issue the commands from the
grub> prompt to bring the system up and do a yum-continue (or whatever
that command is)?

I THINK I have a FC12 live CD at home, as I will get back tomorrow (it may
be a FC11 live CD, so I might have to download and burn it).  From a Live
CD boot, is there a way to mount the partitions and continue the yum
install?

Minimally I can boot from a live CD, mount my /home partition, back it up
to my USB hard drive and then do a new install.  OUCH!!!

Please note that if you have some REAL guidance for me, send it to my
rgm at labs.htt-consult.com email.  This email, rgm at htt-consult.com gets
about 50 messages/hour and from SquirrelMail it will be hard to find your
response.  The labs subdomain gets ~10 messages/hour and I will catch your
response.

Thank you.