My brother spilled a beer on my Macbook while we were sitting in a cafe a few days ago. I immediately turned it off and flipped it over. As I turned it off, I noticed that the screen was going black. I turned it on several hours later and the screen was still black but there was some flickering of white. The next day, it turned on and all has seemed fine since then. My question is whether I'm likely in the clear or whether it may suffer the effects of this spill later on. In other words, once an electronic device dries out and works again, is free from permanent damage or does it just appear to be?