My MacBook does that to me sometimes.
Does the icon in the menu bar say that its on mute? If it doesn't, press the mute button again to un-mute it, then try muting it again.
My MacBook does that to me sometimes.
Does the icon in the menu bar say that its on mute? If it doesn't, press the mute button again to un-mute it, then try muting it again.