GRUB not booting on SATA hdd

When I reboot after installing Mythbuntu I get as far as

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GRUB Loading stage1.5.

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and then it hangs.

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

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

Code:

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sudo grub

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

Code:

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find /boot/grub/stage1

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Enter the location given by the previous command in the next command.

Code:

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root (hd?,?)

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Next enter the command to install grub to the mbr

Code:

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setup (hd0)

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Exit the grub shell

Code:

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quit

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Now Grub will be installed to the mbr.