My MacBook Air is not powering up
It working perfectly well last night. But not powering up this morning.
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Hi,
Following document could help your issue.
If your Mac doesn't turn on - Apple Support
Also check your power adapter if it's working.
If they don't help, you'd better 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