My iphone won't open! I have more information in the details thing?

-so basically its an iphone 4
-this happened a long time ago but i just charged it until it was ok
-i held the home and sleep button but it won't open
-itunes won't recognize it
-please don't say, go see someone. I need REAL answers.
-Please Help ME

Keep holding it till it turns on. Home and lock.