My iphone randomly shut off and won't turn back on. What do I do?

I was listening to music the other day with my iphone 4s on and it just shut off without warning. I though it was out of battery so I charged it overnight. When I plugged it in the phone made the cling sound but the battery sign didn't pop up like it usually does but I left it plugged in. The next day the phone still won't turn on. It seems normal on the outside(no scratches or cracks) and this has never happened before. When I hold down the power button it won't turn on and doesn't give me the sign for low battery. I'm going to send it in to Apple but wanted to know if this has happened to anyone else and if they know what to do.

I hate when that happens to my iPhone:'(! All you have to do is leave it on the charger and don't turn it on until a couple of hours (maybe 2 or 3) and then you want to try to toggle it (turning the power button on and off multiple times). And just mess with it and keep it on the charger and it should turn on:-) I hope I helped you!