what do i do when my iphone 4 doesn't turn on
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iPhone 4, iOS 7.1.2
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iPhone 4, iOS 7.1.2
Force Restart your iPhone.
Press and hold both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple logo.
If that doesn't help, follow the instructions here > If your iPhone doesn't respond or doesn't turn on
what do i do when my iphone 4 doesn't turn on