Try blowing the dust off the jack and from inside the port on your Mac to see if that solves the problem. Dust or fluff is enough to block the port from recognizing your headphones or speakers. Unplug your headphones and try connecting them to another device like your iPhone or iPad to make sure they are working as intended.If your headphones or external speakers don’t work when you connect them to your Mac computer, here are some things you should try to fix the issue: Headphones Not Working on Mac: 13 Things You Can Do Let’s take a look at what to do when your headphones aren’t working on your Mac. Fortunately, there are several solutions you can try to fix this audio bug.