MacBook Air power issue
My Mac suddenly switched off and does not power back ON
MacBook Air 11″, macOS 11.1
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Hi,
If your Mac doesn't turn on - Apple Support
If it doesn't help, you'd better contact Apple Support or make Genius Bar reservation if your local retail Apple Store is open or find opened local Apple Authorized Service Provider to be examined your MacBook Air there.
Genius Bar Reservation and Apple Support Options - Apple
Apple - Find Locations - Location Selector