I'm working on my MacBook air today and all of a sudden the sound drops out completely. Internal speaker and headphones. What's going on? Is my trusty MBA finally showing signs of aging? I tried to reboot it, worked for a little while, like 15 min, and then sound is gone again. Also looked to see if I had the latest OS and yes, I do. I have nothing in Sound properties other than "Internal Speakers". Any ideas?