I have a problem with my rMBP and i'm not sure if it is just an easy fix or if there is a serious hardware issue. I connect my rMBP to an external Epson projector very often to watch movies. I use a Thunderbolt to DVI adapter to connect my laptop to this projector. Last week I noticed that the Thunderbolt Port right beside the power port does not work. When I plug it into my projector the screen on my rMBP goes black and nothing shows up on the projector. I did notice that if I close my rMBP in clamshell mode and use a wireless mouse, it will show up on the projector screen. This is kind of odd because when I connect to the other Thunderbolt port, the rMBP switches resolutions and immediately shows up on the projector. I called Apple, but the guy just told me to take it to my nearest Apple Store. Thats 3 hrs away and I don't want to take the drive if I have to. Is there something that I am missing here??? Or do you guys think that my Thunderbolt port could be faulty. By the way, just to be a little more descriptive. When I connect my projector to my rMBP on the port that doesn't work, my screen immediately turns black. I can still see my mouse pointer, but its incredibly HUGE. About the size of a dime. Please help if you can. I really appreciate it.