My Iphone was working fine (and fully charged) until a few minutes ago when the screen went black. Tried power button, connecting to charger, nothing seems to work.
Found the answer:
According to Apple site (and it just worked for me), hold power button and home button for at least 10 seconds until the Apple logo appears. Allow a few more second for the phone to return to the home screen.
See: If your iPhone, iPad, or iPod touch won't turn on - Apple Support
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