I put a 512gb Samsung 830 SSD in a MacBook Pro 8,2 (late 2011). Everything seems fine except it takes more than a minute to reboot. Applications open right away and Blackmagic Speed Test reports reads and writes in the mid-300s. But when I reboot it spins in the grey screen for close to half a minute before the machine powers down then restarts. After the restart it spends another half minute in the grey login screen before it opens into the desktop. At which point it flies. Any ideas what it could be? What I can check? I should note the SSD was in an iMac 7,1 (mid 2007) running ML 10.8.3 before it was moved to the laptop. I didn't wipe the drive, just created a new account for the wife and deleted mine. Not sure if any of that means anything. When it was in the iMac, reboots took about 20 seconds and Blackmagic reported reads and writes in the low- to mid-200s. Thanks in advance for any help.