Hey dear, the same thing happened to my experia arc. Gosh its brande new.. it fell into the toilet lol.
ok well, bo panic. all you should do is dry it with a vacuum. Or place in the sunshine for few hrs without touching it or turning it on constently please. turning on a cell when its still dry frys the cell. You can also place it infront of the fan for few hrs. When you see its completely dry only than put in the battery and sim and turn it on. Remember they drying process should be done with having the battery and sim out of it in first.
It will really help. If not, than you have to seperate all the partd and dry eah part individually. and fix it and turn it on..