Sound not working on apple mac pro.

Hi for some reason the speaker on my apple macbook pro has stopped working. I can still use headphones however. When I attempt to mute the volume or change it the icon still appears but with a stop sign below it, a circle with a line through it. Has anyone seen this before.
Thanks

Hey Tillybling!
Here is an article that will help you troubleshoot this issue:
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/ts1574
Take care, and thanks for visiting the Apple Support Communities.
Cheers,
Braden

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