This last week I had a presentation in one of my classes and I used my trusty macbook air 2013. I got up to the front of the class and sat my mac on my professors macbook pro 17" (which was closed). I then got it all set up, put the dvi adaptor in, got the projector working, and was about to begin when my screen went blank. My computer wasn't responding, I clicked, tapped some buttons, nothing. This is when I was like, "ahhhhh, somethings not working,..." and panicking a little. I unplugged and plugged the adaptor back in looking all complex. Still nothing. I then picked my computer up and like magic my presentation was back. I suspiciously sat it back down and it returned to its prior unresponsive state. I repeated this a few times with the same results. We then moved her computer and I continued on with my presentation. I got an, "A" on it too if you were interested and it was on human photosynthesis. Soo I have no Idea why this happened. I could think of a few solutions, but then still it doesn't make sense. First thing I thought of was the connection from the adaptor, but I unplugged and messed around with it to no avail. The next thought was that something to do with my computer software or hardware might be faulty. I know that my computer has gone into sleep mode while I'm using it before, but this was a little to conditional. The final reasoning is that my professor's computer was messing up mine/visa versa. I was thinking it might have to do with magnetic radiation, or some other signal being given off. It doesn't really explain what was happening though. Has anybody had this sort of thing happen to them? Or an explanation of why this happened? It was super strange to me. Thanks everybody.