New MBP i5 does not boot after hard disk swap

Hi there,
I received my new i5 MBP today. After booting it once with the installed HDD to check if it's ok, I exchanged the hard disk for the one in my Late 2008 Macbook Pro. After doing this, my Late 2008 Macbook Pro boots fine with the (new) hard disk from the new i5 MBP, but the i5 MBP does not boot with my old hard disk.
To give you some details:
- I have installed 10.6.3 on the (old) hard disk that's not booting.
- The i5 MBP boots fine from the installation DVD
- Disk utility finds and can read my hard disk, no errors
- PRAM NVRAM reset did not help
- when booting in safe mode, I can see the system stop booting after or while loading Extensions.mkext
My guess is, it tries to boot and load the wrong Extensions for the new system (CPU? GPU?). I have no idea how to fix this.
Any help would be greatly appreciated!

Focx,
Welcome to Apple Discussions.
Inserting the drive from an earlier model MBP will probably not work. The version of the system you have on that HD is designed for earlier hardware so when you put in in your new machine it's going to be recognized. What I'd recommend is re-installing the disk that came with the new machine and of course putting the 2008's disk back in the old machine. Then use Migration Assistant on the new machine and migrate your data from the old machine into the new machine.
This will provide a much more stable system and should work just fine.
Regards,
Roger

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