I updated my iphone4 to the new ios7.0.2

I updated my iphone4 to the new IOS7.0.2 and the phone will not stay on, unless it is plugged into a charging device.
I dont know if i've lost my phone completely or not. I bought it 2 years ago.
After updating it on friday, my phone hasnt stayed on since, unless i have the usb plugged into my computer or directly into the wall.
Please help

Oh and i forgot to mention, i updated all apps on my computer, i also deleted and re-installed some of them.

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