For the past few days, my MBP has not been able to play any type of audio. I've check the sound panel in the system prefs and its says there is no audio output. I then checked the system profiler and it seems like there is no audio driver found. here's a screenshot of what it says: I've done a clean format and installed Lion and still nothing. is it a software issue or is it something with the logic board or hardware issue. any info would be appreciated. please help!