Disk Fix via FW to another Mac

I haven't been able to boot my PB since trying to upgrade from Panther to Leopard.
I access the PB hard drive as a FW drive on a Mac Pro, and I've run disk utility on the drive numerous times. It says the drive is OK, but I still can't boot.
Here's my specific question.
The Mac Pro us running Snow Leopard. Presumably, I have Leopard (or some aborted attempt at installing it) on the PB; or still Panther. Does the computer running disk utility need the same OS as the FW-connected HD it's trying to fix?
Thanks for any help.

Is the external drive FireWire or USB? Should be FireWire. Even though there is an Apple article stating that many G-series Macs can boot from an USB drive, in practice it seldom works. FireWire is a sure thing, without having to worry if the USB chipset in an external device is really going to allow booting.
If the external optical drive is not FireWire, I think you should still be able to start the Mac Pro in FW target disk mode (sounds like you've tried) and put the Leo install disk in its drive and see the disk on the PB. This is where you would use the option-boot combo to invoke Startup Manager on the PB.

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