My 9 month old Air (1.6/2GB/80GB- MB003B/A) suddenly lost it's audio this week after great service. Checked System Preferences and all sounds were grey and no audio in/out showed. Then checked hardware - audio - also gone, apart from first line with number. After searching this site for ideas, reset PRAM - still no sound, inserted ear jack a number of times - no luck. So I took Air to nearest Apple store yesterday to see the "Genius" (Cambridge) who ran various diagnostics and came to the conclusion it was probably a hardware problem but not sure which part. Interested to see him use an doctors type illuminated magnifier (the type they stuff in your ear) to check the audio jack hole before inserting audio lead. In the end he decided they needed to retain for repair and ordered the following parts to cover all possibilities :- Logic board 1.6GHz Speaker Assembly Audio board Audio board flex cable (+) Hardware Repair Level 2 (whatever that means) "Problem description: no sound, no audio device present" Estimate 7 to 10 days to repair my Air then another trip to Cambridge to collect, it's a good job I am in the Lake District next week climbing so can manage without my baby. It's also fortunate it is still in warranty as I have not got Applecare for it yet - was searching ebay last week for best deal ! I will post when have further update.