I just received my new 11.6" MBA today and am having this problem. The very first time I turned it on, I got a black screen with white text. The text scrolled down for a few seconds, then the machine booted up normally. I then played around on it for a couple hours with no problems, web browsing and watching youtube videos. But then after I closed the lid and let it set for a few hours, I came back to it, opened it up, and the computer was off. So I press the power button and the exact same process happens again. I just now restarted the computer to see if the black screen with white text would happen again, and it did. Anyone know what this could be?