Open Applications > Accessories > Terminal, and at the prompt type the following command:
amixer set 'External Amplifier',0 mute
In fact, you probably will want to just copy and paste the above command into the Terminal, then see if audio is audible.
Open Applications > Accessories > Terminal, and at the prompt type the following command:
amixer set 'External Amplifier',0 mute
In fact, you probably will want to just copy and paste the above command into the Terminal, then see if audio is audible.