I just bought my 2013 MacBook Pro Retina 13" yesterday. Audio was working fine until just a little bit ago. I noticed it after I attempted to do a restart, the computer hung, for stuck, so I forced shutdown. Upon starting the computer back up, I lost all sound. I get the "dong" sound when I hit the power button, but after that, nothing. Tried resetting the SMC and NVRAM multiple times, no luck. Any ideas? UPDATE: Somehow during the hung restart, my audio settings were changed. I didn't touch them. Damn gremlins. Anyway, what is "Soundflower" in the audio settings?