My iphone 4 blackout after I install the IOS 7. what should I Do ?

My Iphone 4 black out after I install the IOS 7.0. My screen is black now. I still can get call in but I can't answer my phone.what should I do ? How could I reset my phone back ?

First try this,  press and hold the home and power buttons until the Apple icon is displayed, then let go.

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