I have had this audio problem twice on two different machines on which I foolishly installed Yosemite, and this is how I have solved it.Fortunately, the mysterious missing sound output issue is incredibly simple to fix, and there is nothing actually wrong with the Mac.You can toggle the mute button on a Mac keyboard or use the Sound control panel to boost audio all the way up to make sure the Mac sound volume is not on mute.
Sometimes the Mac is simply muted, which obviously when mute is enabled the audio output will not work and sound will not play. If you have already ruled that out, proceed with the next simple troubleshooting steps. And yes, this applies to all Macs with all forms of speakers; internal, external, headphones, earbuds, etc. Do note that you may need to first choose Internal Speakers and then select the external speaker or headphones to get the audio output to work again as intended. This seems to happen most often with Macs that have used HDMI output to a display or TV which has speakers. Interestingly enough, the reverse situation also can occur, where a Mac is connected to a TV and there is seemingly no audio output, at least until HDMI has been selected as the proper sound output channel. Usually simply selecting appropriate audio output in the Sound settings of System Preferences in sufficient, but sometimes you may need to go further and toggle a physical connection in and out of the headphone jack. Audio Headphone Jack Stuck Not Working Update To MacOSOccasionally, the same situation occurs randomly after installing an update to MacOS as well. ![]() ![]() Same with headphone port.) Any other ideas Thank you in advance. Mine got the problem when it crashed while using the output and ableton 9. Seemed to get fixed when changing settings in the program, but same problem reapered. However, it quits my opera browser when i attempt to go again to sound preferences, so its its just a temporary fix for an emergency. At least then its working, its not a fix, but its a trick that works also(and you could just use it forever, but you need to always have headphones plugged in). It was probably cause I havent turned the thing off in a while and it just needed to reset. Hear a bump sound and audio is back But if I let Mac shut down on its own, I have to do it again, but if I shut down manually it will be ok. When I opened the activity center, coreaudiod was using 1.5G of virtual memory and clocking CPU like a bastard. Forcing the stop corrected the issue immediately, without the need for a restart. Eerily, it happened just after I dropped my mac Thanks a ton. No Internal Speakers mentioned, only Optical Digital Output Port and it says that The selected device has no output controls. ![]() Go figure.
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December 2020
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