liquid spill

Shut it off. Let it dry for a couple of days (ideally in a sealed container with desiccant, or with rice). Power up and hope for the best.

But really, your best bet is to have it serviced. Hopefully you have AppleCare in place, which covers liquid damage at a reduced fee ($300 for up to two incidents).

Take it to an authorized service center for evaluation. Liquid damage can be extensive and ongoing.