Hello! So, I am quite a bit desperate with my problem... Let me explain it quickly... I recently bought a MacBookPro (Intel iCore5, 2.4 GHz, 4GB RAM with OS X Lion), and well, suddenly the audio stopped to work. I mean, neither iTunes nor Skype nor Firefox/Safari produce any sound/audio. All that still works are the various "Mac sounds" (not sure how to call them. for example, when I receive an e-mail)... I read a bit about similar issues on various forums, and I tried all the given solutions there (check Audio MIDI-settings, use Garage Band, update software, make hardwarde test, etc.). And that is why I am here now, helpless and desperate. Well, I hope I explained myself... I would highly appreciate if someone actually could help me with this problem. Many many thanks in advance. Take care all!