The mic also functions properly eg. Using that you can plug in headphones and you can plug in external computer speakers.

Audio Jack Not Working On Macbook Pro لم يسبق له مثيل الصور
Macbook pro headphone jack not working properly. Headphone jack not working properly recently one pair of earbuds snapped in half while plugged into my macbook. Look for debris on the meshes in each earbud. Macbook stuck on digital optical out with red light coming out of headphone port. They are really cheap. To remove debris gently brush all openings with a small soft bristled brush thats clean and dry. If the sound is still not working check the headphone jack for issues.
Dust or fluff is enough to block the port from recognizing your headphones or speakers. Reader jeremy saklad reports a problem many have experienced over many years including yours truly. The mic on the earpods works well. Here are the things you should try. Internal speakers will not work. It is basically an external headphone and microphone jack with a usb connector that you plug into your computers usb port.
Check for debris in the headphone port on your iphone ipad or ipod touch. Try blowing the dust off the jack and from inside the port on your mac to see if that solves the problem. Is your volume too low. If your audio drivers are not working then you need to buy an external usb sound card. However it is able to detect the headphones when inserted when i check system preferences sounds and audio midi setup its there. Plug the headphones back in while holding the volume buttons at the same time.
Check your headphone cable connector remote and earbuds for damage like wear or breakage. My retina macbook pro has recently stopped detecting headphones properly when they are plugged. My macbook pros headphones jack is not working properly. This is the first thing you should do when the speakers on your macbook pro are not working properly. Any headphones or speakers connected to the laptop using that jack makes no sound. I messed with the port for hours trying to pick out the stuck tip.
Unplug any headphone or external speakers connected to your macbook pro.