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Helpful answers
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Aug 28, 2015 4:16 PM in response to Jon H 67by Eric Root,Sound – No Sound After Upgrade (2)
Sound – can’t hear sound from speaker - Yosemite
Sound – Troubleshooting Internal Speakers
Try cleaning out the headphone jack and then insert a headphone several time. Sometimes the jack gets stuck.
Sound problems
In the Terminal, type that:
sudo killall coreaudiod
And in the sound preferences, make sure your internal speakers (and not HDMI or other device) is selected.
Other ressources:
http://www.iphonetopics.com/no-sound-after-upgrading-to-os-x-yosemite/
http://betanews.com/2014/08/26/how-to-fix-disabled-audio-in-os-x-10-10-yosemite- beta/
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Aug 31, 2015 5:27 AM in response to Eric Rootby Jon H 67,Thanks Eric, unfortunately none of these work. I don't have speakers as an option in my sound preferences (and they don't appear in audio utilities either)... all I can see in the "Select a device for sound output" box (in Sound Preferences) is Apple TV. Maybe there's a problem with my hardware?