hang-the-9 :
Well, you have water damage. How long did you wait for the system to dry out before you turned it on again? Did you take it apart and made sure all the water was gone? You tried an external keyboard and that also does not work? That is not a good sign, could be motherboard damage rather than just a bad keyboard.
I turned it on once a couple hours after the spill, and the keyboard lit up but the screen didn't turn on so I turned it back off, let it dry for 3 days, then took it apart to make sure there was no more water. Even the on-screen keyboard doesn't work