IPHONE 4 SCREEN IS TURNED ON BUT BLACK SCREEN?

I updated it to the ios7 update on the 18th and last night i was checking instagram and the screen just went white. I left it over night and it was black in the morning so I plugged it into the charger. I know its on because my alarm was going off but the screen is still black. Please Help I NEED MY PHONE TO WORK. I don't have an apple store near me either.

Have you tried holding down the power button?

Hold power and homebutton or plug it in the pc and click restore

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