At some point between yesterday and today, my MBA early 2015 model, has stopped playing any sound through internal speakers except during power up. I have MacOS MOJAVE installed, and software is up to date. I have tried going into the settings -> sound -> output, and the only device listed is the headphones port, which appears to be working perfectly. I tried restarting, but since the internal speakers are not showing up under output, I don't know what else to troubleshoot. To be clear, the internal speakers come on during power up, but that's it. Any help would be greatly appreciated. Tried going through the steps on this thread, however, it did not work.