The sound for my iMac stopped working

Ive been watching music videos, first using firefox, when the sound stopped working. So I gave it a rest, but to no avail. Then I found that safari didn't have a problem, and started watching with it and after a few clips, nothing no sound??

Hello dennis jfromdouglas,
After reviewing your post, it sounds like sounds stops working in a few applications. Does sound qwork not on the internet? I would recommend that you read these articles, they may be helpful in troubleshooting your issue.
Some applications may output no audio, but system alert sounds and iTunes playback can be heard - Apple Support
OS X Yosemite: If you can’t hear sound from your speakers
Thanks for using Apple Support Communities.
Have a nice day,
Mario

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The sound for my iMac stopped working

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