This happened to me for the first time tonight -- I've got about 28K on the car. Started her up, no display on the ACC or stereo although the heat was definitely on. Windows started fogging like crazy too.
It's kind of a relief to find that it is a fairly common problem. I have done some stereo work (cleansweep, etc) and was worried that I had screwed something up. On the other hand, if the problem recurs, that might make it harder to get a replacement under warranty...