I have an iphone and i was sending a multimedia message and all of a sudden the phone turned off and will not turn on.We have been charging it for almost half an hour or more and it still hasnt turned on. How do we fix it?

I have an iphone and i was sending a multimedia message and all of a sudden the phone turned off and will not turn back on. We have been charging it for almost half an hour or more and it still hasn't turned on. How do we fix it?

Wine, were you charging over the USB Connection or AC Power?  We've found in our organization that at times not enough power is generated over USB to recharge it in situations like this...I quote from the email of a fellow technician that i just received today...
I’ve had a couple of users up here bring their iPhones to me so dead that the phone was unresponsive, no matter what we did. One thing that many people do not realize is that the iPhone (iOS devices in general) have power management in them. The power management appears to be set up so that the device will not power on at all until the battery is at a certain minimum level. If the user will plug the device into the power adapter, not a USB port on a computer (laptops especially), and leave it for about an hour, maybe longer, the device will come back to life.
The reason I say they have to use the power adapter is because the USB port is not high enough power to bring the charge up fast enough for the battery to come back out of “hibernation”. 
Each time I have had the users do the power adapter plug in, and leave it for a couple of hours, the devices have come back to life
Hope this helps

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