When your Apple phone suddenly goes black and cannot be turned on, you can take the following methods to try to solve the problem:

Force restart: Applicable to iPhone 8 and later models, quickly press the volume up key and volume down key at the same time, then continue to press and hold the side power button until the Apple logo appears on the phone screen. For iPhone 7, iPhone 7 Plus and other models, press and hold the top (or side) button and the Volume Down button at the same time until the Apple logo appears on the phone screen. For models with a Home button (such as before iPhone 7), press and hold the Home button and the power button at the same time until the Apple logo appears on the phone screen.

Charging: If your phone has a black screen because the battery is exhausted, you can try charging it. Charging time may take up to an hour.

Enter DFU mode: If the force restart does not work, you can try to connect the phone to the computer and use iTunes to enter DFU mode to update.

Check the hardware: If none of the above methods work, the black screen may be caused by hardware failure. At this time, it is recommended to contact Apple’s official after-sales service or authorized repair center for inspection and repair.

Preventive measures: Regularly update the system to fix known problems and vulnerabilities, and avoid using the phone continuously for a long time, especially in high temperature environments, to reduce the risk of system crashes.

Use professional software to repair: If none of the above methods can solve the problem, you can try to use professional software to repair the system. Select the standard repair mode to operate. If the repair is successful, the device will automatically restart.

Contact Apple support or go to an Apple authorized service center for assistance: If none of the above methods can solve the problem, it is recommended to contact Apple customer support or go to an Apple authorized service center for help.

The above is the relevant content about what to do if the screen of your Apple phone suddenly goes black and cannot be turned on. I hope it will be helpful to you!