Macbook Air mid-2011, with El Capitan. I'm dealing with a battery not available (x on battery icon) situation. Short story is that I poured water on the keyboard, old battery died, Macbook Air still worked without battery, got a new battery, and the new battery is giving the "battery not available (x on battery icon)" situation. I thought there might be something wrong with the logic board or something. So I ran the extended AHT. There was nothing wrong. My question is: are there types of hardware problems that the AHT cannot catch?