My mother-in-law just gave me her dead MacBook to look at. She says she spilled a cup of coffee on it. It worked for another 2 days and then just went dead. I just opened it up thinking I would have to put a new logic board in there, but there is no, I mean zero evidence of a coffee spill. No a single dried brown drop of coffee to be found. Suggestions?? Has anyone faced this before?? Help please.