iPhone 12
My iPhone 12 screen went black and then I kept making a siren noise and now it won’t turn on I won’t update you when I plug it into my computer what could be wrong with this what could’ve happened
iPhone 12 Pro
At this point I think your best option is to make an appointment at the Genius Bar in an Apple Store near you and let them look at it. If that is not possible, use the online Apple Support option. Either way:
Genius Bar Reservation and Apple Support Options - Apple