have late 2011 MBP, was running 10.6.8, just updated the OSX to 10.7.4 since 10.6 is not supported in 2012 models. Removed the drive, put it in 2012 and instill won't boot. Shows the grey screen with a circle stoked diagonally - i assume new icon for system drive missing ? when i boot with ALT key pressed. i actually see al the partitions, but even the newly created Lion recovery partition doesn't' boot. what can i do ? seems like i need to update the structure of the boot partition or something ? how to do that ? ps: using Seagate XT 750GB hybrid hard drive.