Hi all, Long story short, bought a used fully upgraded MBA 2014 which should be delivered early next week. The $550 price was too hard to resist. The seller only allows 2 business days for returns, so I have to make sure i do all the checks promptly so as not to be remorseful later on for my frugal habits (i've planned to purchase a base refurbished model initially). I've spent several hours yesterday searching this forum, found heaps of useful stuff but couldn't find a thread that would be like an all-in-one guide to checking a second hand macbook. That's what i'm planning to do so far: * Make sure serial number on the back lid matches serial number in About this Mac; * Ring up Apple and check the warranty status and possibility to add Apple care; * Run Apple diagnostics (restart and hold D); * check battery health (Coconut battery?) * Check the display for dead pixels with this app http://www.macupdate.com/app/mac/10793/pixel-check (any other app suggestions?); * Check SSD health (how?) * Run SSD speed test to see if i'm getting the real deal And last, but most important, the seller i bought from is quite reputable, but still, how do i check if this macbook wasnt stolen? and i dont end up with a laptop that will have serial number blacklisted or even locked remotely in the same way as an iPhone? Apologies for such a long list of noob questions, i've always bought my iPhones and iPads brand new, but first time buying a used Mac. Thanks in advance for your help!