Hello, I'm Denise Garcia. My iPhone 8 went off while watching a tube video and will not power back on
What is wrong with my IPhone 8+?
iPhone 8 Plus, iOS 14
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You can try some basic steps like charging the device for atleast 15 minutes or force restarting it.
If it still won't turn on, you may follow https://support.apple.com/HT201412.