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The glitch can be cleared by selecting another output device and then reverting to the internal speakers. The sound issue could be a result of a temporary software glitch due to which the system could not communicate to the audio device. Kill the CoreAudioD Process Through the Terminal Solution 2: Select the Different Audio Output Device

Now click on the X button to close the process. Then in the search box, type CoreAudiod.Now click on the Utilities and then open the Activity Monitor.Open Finder and then in the left pane of the window, click on Applications.In this context, force quitting the CoreAudioD process of your Mac may solve the problem. This is a very common scenario that occurs usually when process runs into an exception when operating.

You may encounter the error at hand if the CordAudioD process (that is handling all the audio of your Mac) is in an error state. Solution 1: Force Quit the CoreAudioD Process Moreover, make sure no 3 rd party peripherals are attached to your system (it will be a good idea to remove their support software like plug-ins or drivers as well). Additionally, check if the sound can be played through headphones, AirPlay, or Bluetooth. Also, make sure nothing is muted in the sound preferences of your system. Sound Not Working on MacBefore proceeding with the solutions, restart your system. In some cases, users faced the issue after an OS update. Nearly all models of MacBooks are reported to be affected by this issue. The affected user encounters the error when he tries to play audio on his system. Moreover, corrupt or outdated macOS may also cause sound not to output properly. You may fail to hear sound on a Mac due to corrupt SMC or PRAM/NVRAM.