When the water entered, it more than likely began corroding components on the logic board imediately. If you say it was about an hour, chances are it turned off shortly after water entered the bottom due to the water causing shorts on the logic board. You would most likely have to send it to a board repair person such as myself, or another option is look for a used logic board and replace it using the guide on iFixit. Since it is a 2010 your most econonical option may to buy the board and replace it. What you would need to do is open the bottom, find the logic board number (it starts with an “820” prefix and then jump onto google. Good luck and happy hunting!
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