iphone turned off and wont turn back on problem

First of all I want to tell you that Iphone is just awesome mobile system. I am using it from last five month and I can say that it is the best electronics gadget system that I have got. But some time it gives a hard time. One month ago I was facing the same problem that you are facing right now. I was very upset at that time and I was thinking that this problem is happening due to some internal reason. So I decide to go to the service center of the iPhone because at that time my iPhone was in warranty period. When I show them my iPhone and told the exact reason than they told me there is nothing to worry about. Its battery is not working and we have to change the battery. They changed my battery in no extra cost and from that time it is working very swiftly. So I will recommend you to contact service center or change the battery by own self. It was really nice to share my views with you.