Strange epidemic seems to affect first generation Macbook Air. It is as if there was no sound card. By strolling on the internet, we realize that the phenomenon grows, and we do not really know for now if it is a software problem, due to an update by example or material. I find it useful to report this problem. Check your Macbook Air, especially if you're near the end of the warranty. No sound, the sound icon does not reappear, and the camera reports no device in the dashboard.