Why did my iphone 5 turn off and not turn on after a ios 6 update?

I have tried everything it won't show its charging i tried holding down the power and home button but that won't work, the screen is just black and won't do anything. I even tried plugging it into my laptop and that won't work either

Added (1). How do i put it in DFU? I hook it up to my comp and nothing happens at all. Nothing pops up on my comp and my phone won't turn on at all

Because count Dracula is out to get you

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