I just bought a used MBA from Ebay. I got the unit and everything seems to be in order, however, I'm skeptical this has been wiped and restored to factory (the seller said he did). First off, upon power up there is already an administrator account (the seller gave me the password). If he simply setup the account, then I'm fine with that - but i'm in Users & Groups and Advanced Options and looking to change the Account Name, Full name, (Both right now are "mac") etc - and I'm nervous about doing so as the warning says "Changing these settings might damage this account, etc". Plus, there are a bunch of fields that I'm not sure are important or should be changed? Login Shell "/bin/bash". Group = staff. HOme directory: /Users/Mac. And some log code for UUID (do I do set new?) I didn't get any CD's or anything with the computer - curious if I'm fine with it as is, or if I should restore to factory settings? The only thing I've done is reset the admin password.