I bought a 2.4/24" iMac a few months ago. I've already had to have the motherboard replaced (it just died). I've had it back from repair now for a few weeks. I always thought it ran a bit hot. CD/DVDs are really hot when you eject them. Now that the weather is getting warmer, it is running REAL hot! I found some posts where people were talking about the 2.8s running a little hot Since I have been monitoring my iMac, my temperatures are hotter than any other post I have come across. Using iStat Pro, I get the following readings when the computer has been on about 30 minutes and is at idle. Room temp is about 75 degrees F. All measurements are Celcius: CPU 55, GPU 64, ambient 31, memory controller 58, HD bay 53, power Supply 77. I just rechecked after doing this post: CPU 57, GPU 68, ambient 32, memory controller 59, HD bay 58, power Supply 81. Should I just keep using it till it burns up? I,m afraid to use it much. Suggestions?