Migration assistant can't find target disk

I've just bought a Macbook Pro (Leopard), and am trying to use the migration assitant to move everything from my old Macbook (OS 10.4.11), the way I once did when I upgraded from my old iBook (OSX) to my Macbook. Everything seems fine - I plug in the Firewire 400 to Firewire 400 I used the last time, and start up the Macbook in target mode, getting the Firewire symbol and all. However, the migration assitant on my MBP won't find my MB target disk. At first it says "Waiting for disks to appear", then nothing happens, until I get an error message saying the target computer has no OSX...
I've repaired permissions as well as the disk on the MB with the OSX installation disk, but to no avail. To be fair, the MB startup disk could not be completely repaired, which I'm thinking might be the problem. (However, the MB does work fine otherwise.) I've searhed this forum and googled for it, but haven't found much help anywhere. Any chance anybody here knows why it won't work?

AFAIK, the setup assistant only needs to see a good OS on the computer you're transferring from. The setup assistant uses the migration assistant to do the transfer if you select a user account from the drop-down menu. I used E&I and transferred/migrated from 10.4.11. If transferring from a PPC to an ICBM (Intel-chip-based Mac) peruse http://discussions.apple.com/thread.jspa?messageID=1872713 before doing it.

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    http://pondini.org/OSX/MigrationProblems.html

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