How do I reset the sound on my computer?

I've been having problems with the sound. It seems to be more of a software issue than a hardware issue. I switched to a guest account and the audio worked fine on my macbookpro. When I switched to my private account the sound didn't work at all. I think that by reseting something everything would go back to normal. Any suggestions?

I have had this happen occasionally on my iMac. One or the other of these has nearly always worked for me:
• In System Preferences, select Sound, then click on the Output tab. After making sure the Mute box is not checked (if so, a headslap is required    ), drag the blue pointer on the Output Volume slider to any new position. You should hear a 'beep' (or whatever your system sound for such action is), and you're in business.
• If you're using any external device for sound (a speaker system, or headphones), unplug and replug the connection at the Audio Out jack of your computer.
On the very rare occasions where neither of the above solved the problem, a Restart did the trick.

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