Last night, I updated my 2008 15" MBP to 10.8.3 from 10.8.2. It rebooted and all was well... Except my iMessages wouldn't sync between my iPhone and computer... So I rebooted my MBP this morning and it refuses to boot. It's stuck on the Apple with the spinning wheel. So I booted into recovery, verified the disk (all was well), and repaired permissions. Still refused to boot. So I'm currently working on reinstalling OS X on it from recovery. Anything I should do that I haven't yet done? It has a 64GB Sandisk Ultra Plus SSD in it.