I used the reset pram but nothing happened. (ctrl + opt + p + r), although when I did this, it reinstalled OSX. So, I'm assuming thats pram reset. I goto preferences>sound> and it's just blank. No mention of digital audio or internal speakers, just blank. However the mute box is checked and its greyed out. There's no red led in the headphone jack because this is the macbook air. I also accidentally reinstalled the OS, and still no cigar. Anything else I can do before taking it to an Apple store?