I upgraded a MacBook Pro with an SSD, (which probably should have been done a long time ago). Or as of my roommate say: "What's an SSD? Is that like a type of hard drive?" She is not exactly tech savvy. No wonder we are such good friends. lol Anyway, after the upgrade, startup is REALLY slow. It would hang right after power on. I don't mean that it boots slow. It boots FAST! Applications open almost instantaneously after boot. I think that, for some reason, it doesn't quite know to boot from the drive and then hang. It's actually faster for me to press "option" during startup and select the drive.