Screen malfunction Mac Air
This happened to my 5 years old Mac Air air today. There are no signs of any physical damage. Do anyone have an idea what could be wrong and how to fix it?
MacBook Air, 5 years old
Shut down
Disconnect all external devices
reset the smc
https://support.apple.com/en-us/HT201295
reset the NVRAM
How to reset NVRAM on your Mac - Apple Support
then boot into safe mode (it may appear to go away at this point but you still need to reboot and it may come back)
https://support.apple.com/en-us/HT201262
then reboot normally with devices disconnected.
if the problem persists run a diagnostic
How to use Apple Diagnostics on your Mac - Apple Support
if a probem is found you may need to take the device into Apple for repair
call 1-800-MY-APPLE to make an appointment before walking into an Apple Authorized Repair Center.