I cannot un-mute my iMac. HELP!!!

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hi. using mom's imac 1 day , found mac on mute. pressed volume buttons on top right corner of keyboard unmute it. however, did not work tried pressing mute button several times. did not work either. went system preferences, sound , try un-mute it. on 'output volume', found checkbox word 'mute' next it. checked tried uncheck it. however, failed well. there anyway un-mute mac? know speaker cuz gives beep sound on boot when turn on mac. can me? thank much!
 

in system prefs, there's padlock in bottom corner of window. i'm guessing padlocked in "locked" position. can click on that, type in password account, , change sound settings.
 


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