My macpro book's sound is not working

My Macpro Book's sound isn't working - I went in to the System Preferences and all seemed ok. What else can I do?

Hi tambelyn,
Welcome to the Support Communities!
The following article will provide some troubleshooting steps for this issue:
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/TS1574
I hope this information helps ....
Have a great day!
Judy

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My macpro book's sound is not working

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