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Just after opening this thread I had the same idea and it worked!
Thanks for the quick reply anyway. Maybe this thread helps people having the same prob.

Hi everybody. I just got my copy of DP 5.1 (sidegrading from Logic Pro 7). After installing the software and starting it up, I enter my Name and the Key Code. After pressing OK the software scans the inserted CD for a while and then returns to the window where I have to enter the registration info. ...

its not. its universal now. but it loads a ppc version when a ppc instrument (like symphonic instrument) is loaded

Maybe your macbook has some kind of hardware prob? on my dual 2,0 it runs perfectly under rosetta. Even with the new, universal ilok drivers.
Do you have the bios installed that allows to install windows or the standard bios?