Some drops of pure water were sprayed on the keyboard of my 2010 MacBook Air. I immediately tried to dry all of it with a cloth, then turned it upside dow, but open, an put it near the heating, so the rest could dry as well. After a few hours, I tried if it still worked and it did, except that the
Alt key was electronically stuck, i.e. always treated as hold down. I tried a reboot, with the power cable connected, which also worked fine, but I could not log in, likely because the key was still stuck and thus my password was invalid. I let it dry some more with the lid closed. When I next opened it, however, the computer would not turn on at all. This has not changed after three more days.
I fear that something important short-circuited, but I still hope that only the keyboard is not working, including the power key. Is there any way to find out for sure before opening up the case?