Some tips when GRUB gets angry and goes wrong, after/during an install.

Use this command to locate grub stage 1:

find /boot/grub/stage1

Set the GRUB root to the location of stage 1:

root (hd0,0)

Now that we have found the GRUB on the hard drive, load the config file and your away.

configfile /boot/grub/grub.conf

This is more of a note to my self, but good luck.
Pete