Iphone randomly shut off and won't turn back on!

My power button has been stuck recently (not a major issue) and my Iphone 4S randomly shut off without any damage or moisture and over half battery life. Plugging it in to the computer or wall doesn't turn it back on.
I don't know what to do. Any suggestions?

This is very bad. It is very difficult to deal with problems without power button function. If there is Warranty or AppleCare make Genius reservation or set up service and take or send to Apple for resolution. If no coverage, clean iPhone charging port very well with toothbrush and Isopropyl Alcohol. If still nothing, next would be battery replacement. If still nothing, replacement of the charging port with flex cable and lower mic. And on and on. If you want Apple to handle this, they offer perfect replacement iPhone 4S for $199.

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