Quote:
It looks like just the POST screen and the word GRUB at the bottom


If GRUB is anything like LILO, it prints each one of the letters as a progress report. Basically, you need to boot with a rescue disk and get GRUB to rebuild its map file / boot sector / whatever it uses.

You probably need to boot from a CD, mount your hard disk and then run something like:

Code:
grub-install --root-directory=/mnt /dev/hda


But I've not tried this, so no promises.
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-- roger