This may sound silly. You said you keep pushing the mute button and it doesn't turn on. This is not a push button. It flicks up and down. When mute is on you can see red on the side of the button. Flick it the other way, no red and no mute.
Good thinking bear but the OP said he "pushed the button back to normal".This may sound silly. You said you keep pushing the mute button and it doesn't turn on. This is not a push button. It flicks up and down. When mute is on you can see red on the side of the button. Flick it the other way, no red and no mute.