http://trendblog.net/mac-shutting-down-smc-pram-fix/
https://apple.stackexchange.com/questions/176701/macbook-pro-13-inch-mid-2010-shuts-down-unexpectedly
换ssd：https://everymac.com/systems/apple/macbook_pro/macbook-pro-unibody-faq/macbook-pro-13-15-17-mid-2009-how-to-upgrade-hard-drive-ssd.html