My iPod will only stay turned on when plugged in the computer.

My iPod will only stay turned on when plugged in the computer.
I recently dropped my water bottle in my schoolbag and my IPOD was at the bottom. When I went to turn it on it wasn't working. I plugged it into the computer the Apple logo came on. However nothing else happened. I tried putting it on disk mode and re-starting the Ipod. However now (even if the battery is charged) the Ipod will only stay turned on if plugged into the computer.

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