Why won't my Mac boot from a Firewire drive?

Hi all,
I have a 500GB Internal Western Digital hard drive from inside my Mac Pro that I'd like to use to boot my 24" iMac. The drive is running 10.7.2 Server and I've confirmed that it is using GUID (in Disk Utility).
I'm using my Newer Technology Voyager dock over Firewire to connect the internal drive to the iMac. I get the same results over FW 400 and 800.
If I boot the iMac using it's internal drive running 10.5.8, the external drive in the NT dock mounts fine in the Finder. I then open System Preferences > Startup Disk and select the external drive. When I click restart, the iMac boots right back to its internal drive. When I boot the iMac holding the option key, only the internal drive appears.
Suggestions? Thanks

I do not have an answer, but perhaps some experiments.
Can you put the Mac Pro into Firewire Target mode, and have the iMac see the Mac Pro via Firewire?  Target mode is done by booting the Mac Pro while holding down Command-T.  This might confirm that your iMac will boot via Firewire, and that maybe it is an issue with the Newer Tech.  At best it is a way to isolate one component.
Do you have another drive you can experiment with?  Just about any size would do.  Put it in the Newer Tech dock, then try installing any version of Mac OS X via the iMac.  Does that boot the iMac?

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