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What do I do if my iPhone won't turn on at all?
My iPhone is completely unresponsive. No Apple logo, no screen flicker, nothing. I've already tried charging it for over an hour using a known-good cable and charger, but there's no battery icon or a...
Don't panic if your iPhone won't turn on. Fixppo is surprisingly effective for software-related boot problems, and you can run it at home for a fraction of the cost of a repair.
https://www.geekhowto.com/fix-iphone-wont-turn-on-issue