My iphone4S suddenly became totally screen blackout, I try to call it from my other cellular still its ringing how can I open it?

To all concern,    
     My iphone4S suddenly became totally screen blackout,I try to call it from my other mobile its still ringing at the vibration still working how can I fix it,please help me Apple Communities

Try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again. You will not lose data by resetting.
If this does not work, connect in recovery mode to your computer and restore, explained here:
iOS: Unable to update or restore

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