Hi all, a few weeks ago I bought a refurb Rev A Air, all was good, I've been pretty happy with it. I noticed every morning that there were black marks appearing on the left of the Trackpad button - this seemed to correspond with a black mark that'd appeared on the LCD bezel, right by the edge. I took it into the Apple store and got the LCD swapped, good service I felt as I'd just wanted assurance that it wasn't terminal. Unfortunately I've since found that the sound no longer works on the machine. Has anyone else had any of these problems? I'm hoping that the sound issue's just down to the technican disconnecting something and not putting it back together properly. Just hoping i've not got a dud machine here.