Using information from aaron kelleys blog and information available from tab completion I performed the following steps which led to a successful boot. After the
root command, filename tab completion looks at that drive.
Boot from grub prompt:
linux /vmlinuz root=/dev/sda ro
Alternative, equivalent boot from grub prompt:
After booting, these steps updated grub on the MBR for my root drive:
linux (hd0,5)/vmlinuz root=/dev/sda ro
sudo grub-install /dev/sda sudo update-grub
For a taste of the flip side, I restarted into windows for windows update. Looks like it's been 6 months since I booted windows7, so 300Meg to download. Question: Will it be finished or pwned when I get home tonight?