Disappearing Start Up Disk

I had successfully migrated from a G5 PPC to a new MacPro 8 Core, or so I thought.
The entire contents of the old machine's boot volume with all my settings was successfully mirrored onto the new boot drive BUT when I moved a second SATA drive from the old machine to the MacPro it doesn't see it as a potential start up drive. I used this second drive to dual boot in Tiger to run Avid MC3.0.1. Is this an issue with Leopard and how do I get the second drive to appear as a bootable volume? Thanks for any suggestions. Otherwise the new Mac is awesome.
I haven't updated the OS yet, might that help?

Thanks for getting back so quickly Niel, luckily I have just purchased a new stand alone Avid version MC3.5 so that should run on OSX.5 and higher. No need for Tiger. But two new problems have appeared...
Firstly a pair of 1Tb SATA drives I used to run in an external SATA enclosure and had been partitioned under OSX.5.4 and which I mounted in the extra drive bays of the MPro now only appear as unformated volumes. When I tried repartioning one of them (they're full of music and Quicktime media) it now mounts but appears empty... I don't want to risk wiping the other one at this point...
The other problem is that the install disk with the machine is 10.5.1 but any attempt to update to the 10.5.7 Combo updater downloads but fails to verify and install. Any thoughts on that?

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