I may be just being paranoid here (I really hope so), but it seems like my late '09 iMac is running warm. I'm running the 27" i7. I received it from Apple just before Thanksgiving and all was well. I have to admit I didn't take notice of my temps specifically at the time, but under minimal usage you could hardly hear the fans at all. Well, last weekend my hard drive was on the verge of crashing (S.M.A.R.T. failure imminent) and so I took it to the Apple store and it went in for a new HD swap. I got the call to pick it up after work today and got it home to transfer all my data from a time machine backup. A few hours later I was back in business. The only thing I noticed was that my temps (using iStat) were way up to 55 deg. C for the CPU and the fans were cranking. I turned it off for 15 minutes or so then back on again. The machine was still running between 45-48 deg. C after just a few minutes. The fans weren't going as loud as they were before shutting down the first time, but still not nearly silent like the computer was prior to the HD swap. I do plan to check things out in the morning again after being off all night long. Like I said, I guess I'm a little paranoid because of how the computer was treated at the store. I noticed when I got the computer home that a couple placed on the aluminum housing were scratched up from when it was worked on and there were even hand print smudges on the UNDERSIDE of the glass panel. This just tells me that the tech(s) were probably being a little careless fixing it so who knows what they may have done on the inside that I don't see. What sort of temperatures are the rest of you seeing?