It was all good, until that damn 10.8.5 update... I have an iMac Early 2008 model (32bit), and for whatever reason after I made that update my audio devices stopped showing. At first a simple restart would fix it, but slowly it got worse. So I decided to reinstall the OS. That worked for an extra couple of days, and then it began to shut down on me again. This troubled me, so I started to research the problem. I decided maybe it'd be best to go back to 10.8, you know, when times were simple and care-free for me. This bought me a couple more days..then the problem arose again. To be specific: I go onto "Audio Midi Setup" and there are no devices found at all I go to "Sound" in the system preferences, there are no output or input devices to be selected. I normally run my computer's audio through an external audio interface (The M-Audio Firewire Solo) and when I load up the actual "M-Audio Fire Wire Solo" application, it detects that the interface is in fact there, and computer sounds (I.E emptying the trash, and turning on the computer) plays just fine through internal speakers/monitor speakers. I just can't get any music to play, or any audio other than said computer alerts. Things I've tried: Resetting the PRAM Downloading the Combo update Plugging speakers into the internal headphone jack Repairing Disk & Disk Permissions Restarting the computer, unplugging the power plug for 15sec, plugging back in. Downgrading to an earlier Mountain Lion software Reinstalling Firewire Solo's Drivers Upgrading BACK to 10.8.5(glutton for punishment?) I desperately need help guys.. I'm out of options it seems.