I have green screen on my MacBook Air
I have grey screen on my MacBook Air. It is about seven years old.
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Hi, and Happy New Year.
Following document could help your issue.
If your Mac starts up to a blank screen - Apple Support
If it doesn't help, contact Apple support or make Genius Bar reservation if your local retail AppleStore 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