Macbook Pro wont startup on an external backup

My machine: OS X 10.6.3 - 2010 MacBook Pro
My backup drive: OS X 10.5.5 - 2004 Power Mac G5
Problem: Backup drive boots fine into my MacBook Air (10.6) , also tested fine on another old white MacBook. But it freezes when my MPB tries to boot from it. Just hangs at a grey screen (tried restarting and holding Alt and starting up from system prefs)
Other notes: The 10.5.5 drive mounts and works fine when I plug it into my MBP.
I'm guessing there is some conflict - Perhaps something to do with 64bit / 32bit?
But how do I solve this? Will it work if I upgrade my 10.5.5 backup drive to Snow Leopard? Or is that not possible at all since everything it is PPC configured?
Please let me know what to do. It is important because all my iPhone data is on that drive, and I periodically switch back into my 10.5.5 backup to sync my iPhone.
Now I am going to sell my MacBook Air, and I'll be left with the MBP. So I need something that can boot up the 10.5.5 for my iPhone syncing.
If that can't work, how can I port over all the iTunes + iPhone data over to my MBP so that I can sync my phone again. (Previously only had 80gb in my MBA, and my iTunes library is over 500gb worth of stuff)
Thanks so much for the help guys! Much appreciated!

Well, your new MacBookPro, depending on when you bought it, may not be able to run Leopard at all if it shipped with 10.6. If it shipped with a version of 10.5, let's say 10.5.8, that was higher then 10.5.5....same thing.
I suppose you may have gotten lucky with the older Macs because the G5 probably had a universal (Retail) install of Leopard and may have enough drivers for your other older Macs to use.
But the bootup is maybe what we are not connecting on here with our conversation. Are you actually booting up on that G5 drive, running 10.5.5, using System Preferences or the Option key at startup with you other Macs?
Because accessing things on the drive and booting up on it are two different things.
Dale

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Macbook Pro wont startup on an external backup

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