I updated my Mc to to the new operating software and the sound is gone and I can't get it back

I have upgraded to OS X Yosemite and now the Sound in gone and I can't get it back, The volume symbol is also grayed out.

Sound – can’t hear sound from speaker - Yosemite
Sound – No Sound After Upgrade (2)
Sound Levels - Troubleshoot
Sound – Troubleshooting Internal Speakers

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