Hey there OP,
If you're suspecting water damage, then the only real way to be sure is to [guide|141729|open the system up] and visually inspect for any corrosion or other evedence of liquid damage. If you do find that any components are liqud damaged then you are going to want to clean the damage. We do have a [[Laptop is Liquid Damaged|wiki on this for laptops]], but the information for cleaning should work just the same in this instance.
Best of luck to you.