This issue first occurred about 6 months ago for a day, then started happening persistently the past week. The sound on my MBP won't work as well as the mic/headphone jack. I've gone through the preferences, both sound and input don't register a device available. If anyone knows anything about this, it would be appreciated. I have yet to factory restart my computer (last resort) as I'm hoping someone will have some advice before I have to go down that route. Thanks in advance for any assistance