Can't turn off MacBook build in mic

Discover can't turn off or even set the internal mic
Level to 0 still getting sound in? This is no problem
On iMac by select line in or set level to 0.
Also in macbook there is no line in.
Anyone can advise thanks

Theoretically, a Mac should only boot into Target Disk Mode if it is connected to another Mac. However, if you are unable to power down the computer, a viable solution (given that this is a laptop) would be to unplug the MacBook Air from power and allow the battery to discharge fully, which will shut down the computer.

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