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if none of these work it is prob the battery, and if it is, there should be a little sticker on the battery that turned red when it got wet. (so the phone company can tell if you dropped it in the water) take some bleach and dab it on the sticker to make it white then go to the store and ask for a replacement. they will give you a free or discounted battey depending on how long you have had it.
don't try to turn it on for at least 2 days, that way the water wont short circut it.