All,
I may have solved this issue.
I just installed two different kernels, the vanilla "generic" and "server".
All exhibit the same behavior as I fist listed above.
On a hunch, I went into my bios and set the Video Graphic Mode to "SidePort" 
instead of "UMA+Sideport"
Installing the other kernels put grub back to a default status, and removed my 
added vga=791.

Now, the machine shuts down properly.

Is this a bug with the radeon driver, or some type of memory write
issue?

Robert

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Jaunty & Interpid: won't power off on shutdown or reboot
https://bugs.launchpad.net/bugs/326988
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