I have my MBP running an external monitor. Sometimes, and quite a bit lately, when I close the MBP, but don't turn it off, the second monitor tends to come back on at some point soon afterward. Since the laptop is closed, that causes all the windows on the MBP screen to move to the external monitor. Needless to say, this is annoying on two counts. One is that it happens at all. The other is that I then have to move everything back again. Why does this happen and what can I do about it? I love my Mac, have become something of a Mac geek, but it gives me at least as much trouble as my Windows machines used to. I wouldn't go back, I use the Mac 95% of the time, maybe more, but anyone who thinks these things "just work" is kidding themselves.