volume stuck on mute, cant untick the mute box in sound settings (macbook air)
This appears when i try to raise/lower/mute the volume with the keys.
I cant tick 'unmute' because the button is faded/greyed out and i cant click on it at all.
How can I fix this and will it be very expensive?
Thank you
MacBook Air, macOS Mojave (10.14), null