I normally just put my macpro to sleep when I don't use it (and I normally use it on a daily basis). I've had it and the 'Apple LED Cinema Display (24" flat panel)' for about 3 months now. I went away for a few days and shut it down completely, when I got home, there was a massive condensation mark across it (on the inside), which took up half of the screen! It looked like Frost!! I turned it back on and within half an hour it vanished. Has anyone else experienced this, and what could have caused it? It's totally fine now, but should I send it back?