Sound doesn't work after updating to Yosemite.

iTunes, sound effects (swoosh when mail is sent), videos on internet...no sound at all since updating to Yosemite. I press the volume key and get the symbol of a speaker with a circle crossed out beneath it. Not over it, but beneath it. I went into system preferences and sound, but don't really understand what might need to be done there or even if that's where the problem is.

1.Plug in and  remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
    Try this even if you don’t see the red light.
2. Reset PRAM.  http://support.apple.com/kb/PH14222
    Do this twice
3. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the  appropriate method.

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    3. Reset SMC.     http://support.apple.com/kb/HT3964
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