Month ago two things happened to my Macbook pro mid 2012 with El Captain, it fell down and I spilled around 50 ml of water on the keyboard and touchpad and immidiately wiped it out. I don't remeber how much time passed after this accidents till the moment when my mac started to work extremly slow(1 to 3 days maybe). Almost any click provokes pinwheel. I ran extended Apple hardware test and it didn`t find any problem. Does it mean that water spill did'nt damage my mac? What should I do in this situation? I would like to go to service ceneter but I have extremly limited budget right now.
Also there no overheating or noisy fan. But I remeber that once it didn't go sleep. Is it possible that hdd cable is damaged?