iPhone not turning on
When I woke up my iPhone screen is black. I tried to turn it on but it's not working as well as the troubleshooting options. My battery was at 50% before I slept.
iPhone 12 Pro Max, iOS 16
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Perform a Forced Restart on the phone. Follow the instructions very carefully, as this is a bit tricky. You may need to repeat this several times.
Force restart iPhone - Apple Support
There are only 2 possible results when you perform a Forced Restart:
1) The phone returns to normal operation.....or else.....
2) There is a hardware problem with the phone that will need attention at the Apple Store (make an appointment) or at an authorized Apple Service shop.
You can use the link below to find a list of authorized service shops in your area