Press and hold both the side button and the volume down button until you see the Apple logo. If your phone doesn't turn on, follow these steps to check your hardware and charge your phone. You might need to charge for up to an hour. If your phone still doesn't turn on, contact Apple Support.
Most often, a black screen of death issue can happen from damage to the screen during a bad drop or accident. If the components connecting the screen to the motherboard sever, the phone screen will be unresponsive. But the black screen of death can also happen because of software issues in the device.
There are a few different reasons why your iPhone 11 might not be restarting: A software crash has made the screen completely black. It's out of battery life and not charging. It's broken.
It's possible your iPhone 11 won't turn on because it's out of battery life and not charging. Take a close look at your charging cable and check for discoloration or fraying. Try charging your iPhone 11 with a different cable to see if it starts working. Try using a different charger if your cable looks fine.
Reset iPhone in Recovery Mode
There is a final way you can try if force restarting is either not working. That is put your iPhone into recovery mode and reset it with iTunes. This is a final method you can try since iPhone data will be erased after reset.
Restart your iPhone or iPad. Make sure that your screen is clean and free of any debris or water. Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.
The Black Screen of Death is usually caused by a software glitch (or Windows Update) but can often be repaired. Black screens that occur seemingly at random are usually the result of a more serious hardware problem. This will require component repair or replacement. Whatever the case, there is almost always a solution.
The solution: You should be patient and wait; you don't have to press anything and prevent the installation — it can only do harm. Upon completion of the process(it may take for a few hours!), the computer will restart itself and the Windows black screen of death will disappear.
Restart the computer
Whether the black screen issue began before or after login, you should first try to restart the computer. Sometimes all it takes is a simple reboot to get the system back on track. If you can't restart the computer the normal way, try to access the power button by pressing Ctrl + Alt + Delete.
Press and hold the side button until the power-off slider appears. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device. To turn your device back on, press and hold the side button until you see the Apple logo.
The most likely reasons why your iPhone won't turn off are: It's frozen due to software problems. The Sleep/Wake button is broken. The screen is broken and isn't responding to taps.