I don't have any sound after uppgraded to Yosemite

After i upgraded to OX Yousmite i can't get any sound from my internal speakers on my mac-pro. Does someone have any answers for me/regards Martin

  Reset PRAM.   http://support.apple.com/kb/PH18761
Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".

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