![]() ![]() Back up all data before making any changes.ġ. Take each of the following steps that you haven't already tried. There are many possible causes for this issue. Has anyone else encountered something like this or does anyone have any suggestions? I really don't want to have to choose between security updates and being able to hear anything via the MacBook. So it's something specific about the 10.10.5 update and what is probably an audio extension update.Īt this point I've already tried the usual tricks such as repairing the hard drive permissions, with no change in status. Similarly, restoring a TM backup to an earlier version of OS X puts everything back in working order as well. ![]() The physical hardware itself is fine, and the MacBook still chimes at startup. Built-in speakers or with headphones, it doesn't make a difference. The MacBook seemingly forgets that it has audio hardware, and behaves as if there is no sound hardware installed there is no volume control, and items are missing from the Audio section of System Report. With 10.10.4 audio was working as expected, however after upgrading to 10.10.5 audio ceases to work. Much to my surprise, I have found that installing the 10.10.5 update is breaking audio support on my Retina MacBook (2015). ![]()
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