After Yosemite install, sound button on MacBook Pro doesn't work-stuck at full volume or Mute. Can't adjust slider in preferences, or use volume button on keyboard.

Just installed Yosemite on my MacBook Pro 15", Retina display, early 2013 build. After installation, I cannot adjust volume for speakers. It is either completely off (muted) or on a FULL VOLUME. Neither the speaker volume buttons on the keyboard or the Sound Output slider on the Systems Preferences works. The slider does not move from full volume and the speaker buttons do nothing. This is just awful--can't get any sound except at full volume which is ear-splitting.

Talked to Apple Support. The support person took a bit, but figured out that Yosemite changes the sound output default to the installed HDMI display speakers--and the Mac does not control those speakers. This recurs every time there's a restart. The Solution is to go to System Prefs>Sound and change the OUTPUT device to the Internal Speakers on the Mac. Then sound controls work perfectly. This has to be done every time the system restarts, at least until Apple sends out a fix for this bug.
If you have an external device attached with speakers, apparently the Mac wants to make that default output device. Note that in my system on the list of output devices, the Internal Speakers are the first in the list...that generally is the "default" output device--but Yosemite doesn't recognize that and makes the HDMI device default output.
Not perfect, but now that I know the fix, I can live with it until there's a permanent fix from Apple.

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Hopefully one of these steps should solve the problem.
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Message was edited by: EZ Jim
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After Yosemite install, sound button on MacBook Pro doesn't work-stuck at full volume or Mute. Can't adjust slider in preferences, or use volume button on keyboard.

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