Did the phone have enough charge?
Plug in to power and wait a bit.
Still no luck?
hold power, and both volume buttons at the same time. Wait. Does it reboot?
I'm sorry you are having this issue with your device, ljoffre. Software updates are critical for your phone and let's work on this together. Mama23dogs recommended a significant step. Have you completed an unresponsive reset using the steps on this link? http://spr.ly/6587D0lot Also, are you using the original charger? Please keep us updated on your progress.
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