OK, I did the same thing. I spilled a small amount of water on the keyboard. Well someone did. All of a sudden the MacBook wouldn't boot up. I took the battery out and found a small amount of water leaking through. I took the computer apart and dried it out for three days, put it back together and it ran normally for a week. Now it starts to boot, gets to the white apple screen then just goes black. I pulled the RAM and cleaned everything with alcohol. Then it booted normally. Now anytime it shuts down it won't reboot back up, but if I pull the RAM and re-install it it will restart normally. Based on the other similar issues I'm reading about here it seems like it's probably the logic board. Any other ideas out there before I replace the logic board?