all i need is that my macbook air is stuck on mute and when i go into settings then sound, the mute box in stuck grey and i can't do anything about it and i can't unmute it. When i click the sound up or down buttons, all it does in show the icon with an ø a the bottom, showing that i can not turn up or down the volume. Headphones will not play audio either unless they are bluetooth.
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It might just be the connector between the I/O board is misplaced. Try a SMC reset and check the connector is firmly in place as first things.
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this was after i changed the display
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