sound on my macbook air ain't working even after checking system preferences. please help
My inbuilt speaker is not working. I can't get a sound from my computer
MacBook Air 13″, macOS 10.15
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If the internal speakers on your Mac aren't working - Apple Support
Try all those suggestions, but before you get to Step 6 try resetting that Mac's NVRAM:
Reset NVRAM or PRAM on your Mac - Apple Support
Note "This article applies only to Mac computers with an Intel processor."