Moving Time Machine Backup from Old Mac to New Mac

I had my old MacBook happily backing up via Time Machine to my Time Capsule. Then I bought a new MacBook and moved all my files etc across with the Apple Migration Assistant.
However, having problems with TM - tells me there is no room on my TC to complete my backup (not true, plenty of disk). However, I suspect this is because it views the backup data on my TC as "owned" by the old Mac and hence that chunk of disk is unavailable to the new Mac.
Is there a way to associate the old backup data with the new Mac?
Or do I need to wipe the TC clean and start all over again?
Thanks,
SM

Hello only:
I performed a similar migration a couple of months ago. In my case, I used a SuperDuper clone on an external firewire drive as the source, but what you describe (#1) should work fine. In any event, keep the G5 handy as you can firewire attach it to the new Mac if you wish.
If I were you, I would just delete the files you do not wish to move from the G5, run a backup now for Time Machine, and then proceed with your transfer.
Barry

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