The new iMacs seem to be getting more than their fair share of problems. After reports of the graphics card freezing up the system, there now may be a condensation problem in the computer's hardware.
According to the Apple support forum, more than a few users have experienced condensation behind the LCD. For now, there is no mention of any damage resulting from this, but as we all know, combining water and computers is never a good idea (unless you're talking about water-cooled systems).
We have contacted Apple regarding this issue and are awaiting a response.