I have a MBP which I booted from an external 3.5 with Lion 10.7.2 on it. AFter shutting down and restarting from the internal HDD, the machine boots up to a blank white screen. This is post Apple appearance and HDD selector. It has same issue now from both internal and external drives. ANyone have a similar issue with their MBP's. My MBP is the 2ng generation 17" 2.33 with 2gb Ram, 160gb HDD.