my iPhone 12 screen is completly black and won't turn on
I has plenty of battery but when I hold in the on/off button nothing happens.
iPhone 12
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Hey there,
try first this steps:
Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the side button. When the Apple logo appears, release the button.
if that doesn’t work for you See this article ☞ If your iPhone won't turn on or is frozen - Apple Support