So I received my new-to-me 24" LED Cinema Display today and first things I'm doing is checking everything for functionality before my return period runs out. The display works fine, however I cannot get any other feature to work. iSight camera isn't recognized, neither are the speakers. Plugging a flash drive into the USB ports doesn't cause any reaction. The flash drive isn't even getting power. So the big question, is this ACD broken? Or do I need to perform a firmware update? Or is it a Mavericks issue? Only other strange thing is that the brightness control does not appear in preferences, though I believe that the brightness control is over the mDP cable so this leads me to thinking its a software issue. Before anyone asks, yes I am plugging in the USB cable. And I've tried both ports on my MBA.