Used my 5-day old iPhone 5c and noticed charge was at 50%. Fifteen minutes later tried to turn it on to use it, and it was dead. Held the "on" button on for 20 seconds; still won't come on. Plugged it into charger; won't charge.
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Hold home button and "on" button (also called sleep wake button) together for 10 seconds. If all goes well you'll see a forced reboot and the Apple symbol.
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