Hi, I have an imac 2007. I have been living in Ireland where it is quiet cold, I have just moved to Brazil, today it is 30 degrees C. When I turned on my imac the fan was really loud. The computer doesn't even feel hot to touch as I haven't been doing any work on it so far. I installed iStat nano, and the readings were: Temp 44, the hard drive fan was up to 5000,and the highest temp in the list of temps was CPU Diode 57. If this is normal in a hot climate then I can put up with the noise, I just want to make sure that it is ok. I do a lot of graphic work so I hope the computer can stand the heat. I did a test, turned off the computer, turned on air con to 16 degrees for 30 min and when I turned the computer back on it was quiet again. But I'd rather not have to always sit in a cold air conditioned room when i am working, so if it is ok that the fans are whirring super fast then that is ok, I just need to know, Thanks!