I agree with bassfisher. Liquid on the keyboard flows down in 1 second, and a computer is not amphibious. You've probably blown the part of "sound out" on your computer.
Not knowing your computer, there may be a possibility of another output for sound, but I would recommend to take it to service. Even if you get it to work now, can you trust it? I foresee future problems. There's probably liquid / moisture inside the computer, and it's very hard to tell what it can cause.
Best of all.