13 Inch Macbook Pro No Audio Input

Audio Input Output on MacBook Pro 13 inch - Apple Community

https://discussions.apple.com/thread/2036358

+"Choose Apple ( ) > System Preferences, and open Sound preferences. Specify whether you want the port to be used for audio input or audio output."+ This means you must choose whether you want the single audio port on the 13" MBP to be input or output.

macos - Audio Input not working on 13-inch Macbook Pro Mid ...

https://apple.stackexchange.com/questions/136969/audio-input-not-working-on-13-inch-macbook-pro-mid-2012

I am trying to connect an audio device (analog synthesizer) to the input of my 13-inch Mid-2012 Macbook Pro running OS X Mavericks 10.9.3. The synthesizer's output is a standard 1/8th inch stereo plug. According to http://support.apple.com/kb/ht3625, I should be able to switch this from System Preferences.

Apple 13" Macbook Pro : no more optical audio input ...

https://gearspace.com/board/product-alerts-older-than-2-months/396337-apple-13-quot-macbook-pro-no-more-optical-audio-input.html

SOLVED: No audio, and no "Internal Speakers" in ...

https://www.ifixit.com/Answers/View/376339/No+audio,+and+no+%22Internal+Speakers%22+in+SystemPrefs%3ESound%3EOutput

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No Input and No Output Devices Found on MacBook …

https://www.ifixit.com/Answers/View/447966/No+Input+and+No+Output+Devices+Found+on+MacBook+Retina+2015