I have just bought a new MBP. On my old MBP ( 2010 ) - I was running Lion 10.7.4 ( latest ). I have taken out my old hard disk from my old MBP - to use it as an external drive - so I have a complete copy of my files. I want to be able to boot from this drive. Unfortunately - the new MBP won't recognise the drive as bootable* ( it mounts fine and I see all my files ). I want to 'update' the system on this drive so it will run on the new MBP. Is this possible and if so how? Many thanks * As I understand it - this is due to the new MBP having a different chipset etc. making the system from my old MBP not functional ( despite being the latest ).