F9 - F10 Upgrade Left only GRUB prompt

[Richard England]

I used preupgrade (1.0.0-1.fc9.noarch) to upgrade a Dell Latitude laptop 
from F9 to F10. Every thing seemed to go fine but on reboot I'm getting 
only a GRUB prompt.

The machine had a fresh F9 install (not an upgrade) and was fully up to 
date. 

Is this a case of grub.conf being out of wack or a naming issued with 
the disk partitions? I've been googling and found a couple of things to 
check out but I had to "abandon" the machine at work so I won't be able 
to get back to it until later in the week to get more details.

Any insight about what to look for or possible remedial actions would be 
most gratefully appreciated.

Thanks,

~~R