Speaker Not Working

i have a macbook 2009 with osx mavericks (10.9.4). so i was watching youtube, then suddenly my macbook freezes and i can't do nothing about it. so i force shutdown and turn it on again. when it's on, my speaker is not working and when i check the sound preferences there is no built-in speaker and microphone option. i've tried to plug in my headphone and it's now working as well.

Hello Daniel William
Check out the articles below to troubleshoot issues with no sound from your speakers on your MacBook Pro. Start with the resetting the NVRAM to see if the resets the sound volume. If that does not work, then check out the second article for additional support.
About NVRAM and PRAM
http://support.apple.com/kb/ht1379
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/TS1574
Regards,
-Norm G. 

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