I don't know how this happened, and I'm really not concerned with how it happened. A few weeks ago, I noticed some condensation on my screen after I left my black MB closed during class time at my work (I'm a teacher). I didn't think much of it. It kind of puzzled me though. Well, today I opened my screen, and some of the keys were wet. It's just water, but now the backspace key, ;;'', the question mark key, ..,,mb the N key, the D key, the R key, and the 3 key don't work. It's out of warranty. Should I just leave a fan blowing on it for a few hours? I'm using it now with an external keyboard and everything is working fine. I was also thinking of converting some videos (fans full blast, a lot of heat) and seeing if that helps the water evaporate. Any more ideas would be great. I was going to take it apart but the middle screw on the bottom of the machine was tightened by Hercules himself. I can't get it loose.