Delayed Liquid Damage

Coffee is bad...first off, but apparently you did not have any sugar in it or spilled such a little amount that your computer still worked for so long after it... Here's what i do frequently when a customer has this issue...If you remove your macbooks top-case, and take a spray non-conductive electronics cleaner and lightly spray the logic board, then take a soft toothbrush and scrub the board, especially over spots where you see some spill residue, take out the ram and scrub it with the toothbrush too (Dont worry, you wont hurt it!) Let it dry for a few hours and then turn it on. If your lucky, you will have gotten it to work, if not... theres a good chance something else went wrong with your laptop, unrelated to the spill... bad ram slot, bad power button, etc...