Volume not working after update to mountain lion?  cannot figure out how to fix

update to mountain lion today, now cannot listen to itunes, no volume on facetime etc . . . cannot figure out what problem is
Thanks

Hi Al,
Long shot, but...
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back.

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