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Thanks, heronbas - I was glad to come across your note. Setting BIOS to AHCI also solved getting DOS to boot on a 6Gb/s Sata-3 drive.

Thanks Rich_S - worked for me too!

lightdm broke in 12.04 when attempting to add a 2nd display with nvidia. now back to that - hopefully won't break again.

Many thanks to Ubuntu and the posters here - saved the day (Windows CD's did not work - were getting 0x0000007B errors):
sudo apt-get install lilo
sudo lilo -M /dev/sda mbr