Missing sound. my Mac Pro does not have any sound

My computer does not produce any sound when playing back any media files

Good Morning gmcres,
If you are not hearing sound from your computer, take a look at the troubleshooting steps below.  Is this only happening in iTunes?  Are you able to hear system sounds (alerts, etc.)?
OS X Yosemite: If you can’t hear sound from your speakers
https://support.apple.com/kb/PH18958?locale=en_US&viewlocale=en_US
Have a great weekend!
- Judy

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