Using 24 inch iMac (purchased a year and half ago). There seemed to be moisture forming in the lower right hand corner of the iMac screen (about 6 inches wide and 2 inches tall at worst). i have read that this seems to be a common problem. Had the iMac for about a year and half and never saw this issue though. Based on forum research, the recommendation was to turn on the AC to reduce humidity. Moisture definitely disappeared after 30 minutes, however I'm concerned it will happen again. I suppose I will bring it into Apple concered (although i would rather avoid dealing with it). Has anyone else experienced this? Any advice?