GRUB not booting on SATA hdd

[nalbion]

When I reboot after installing Mythbuntu I get as far as

GRUB Loading stage1.5.
and then it hangs.

I can boot using a live CD, or a KnoppMyth install, but I'd prefer to use Mythbuntu

[bulldog]

You can try to reinstall GRUB with the live cd.
When you get to the desktop open a terminal and type the following commands.

This will get you a grub> prompt

sudo grub
This will return a location which you have to use in the next command.

find /boot/grub/stage1
Enter the location given by the previous command in the next command.

root (hd?,?)
Next enter the command to install grub to the mbr

setup (hd0)
Exit the grub shell

quit
Now Grub will be installed to the mbr.