My iPhone 4S is unresponsive?

My phone was working fine and then the home button stopped working so I changed the setting so it was an on screen home button. I went to bed and the next morning my phone wouldn't turn on, I tried charging it and it was un responsive I tried the home and lock button combination and it still won't work, i don't know what's happened to my phone, any help would be much appreciated, thank you.

It almost sounds as if it has gotten wet.

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