My macbook sound is not working. No idea what happened!

It was working a while ago when I left home. I packed it in the case and put it in my backpack and walked to the library. I just took it out after sitting down and it doesn't work.
I'm horrible with technology!
The sound bar isn't on mute, and everything's okay in the settings.

Hey tilliesss,
Thanks for the question. I understand you are experiencing issues related to Sound on your MacBook. The following resource may provide a solution:
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/TS1574
Thanks,
Matt M.

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