On iPhone 8 or later, including iPhone SE (2nd and 3rd generation)
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Press and release the volume up button quickly.
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Press and release the volume down button quickly.
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Press and hold the Side button until you see the Apple logo.
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If your phone won't turn on, follow these steps to check the hardware and charge your phone. Charging time may take up to an hour.
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If your phone still won't turn on, contact Apple Support.
On iPhone 7 or iPhone 7 Plus
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Press and hold the Side button and Volume Down button simultaneously until you see the Apple logo.
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If your phone won't turn on, follow these steps to check the hardware and charge your phone. . Charging time may take up to an hour.
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If your phone still won't turn on, contact Apple Support.
On iPhone 6s and earlier, including iPhone SE (1st generation)
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Press and hold the Home button and the Side or Top button at the same time until you see the Apple logo.
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If your phone won't turn on, follow these steps to check the hardware and charge your phone. . Charging time may take up to an hour.
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If your phone still won't turn on, contact Apple Support.
The above is all about what to do if your Apple phone has a black screen and cannot be turned on. I hope it will be helpful to you.