Hi all, About a week ago i purchased an iMac 27' top model. Now recently I'm hearing a strange noise coming from inside of the iMac. It sounds a bit like a ratteling hard drive, like it's contant busy, but I know it's not the HDD, because that noise is a bit darker than the sound I'm hearing. I hear it constantly, and I'm sure it's not an external drive or one of the fans. Using SMDfancontrol I set every fan to max, 1 fan at a time and the noise didn't became any louder. Can anyone explain to me what this noise may be? I prefer not sending it back to Apple because the screen is just perfect. EDIT: I just turned my mac into sleep, and then the noise slowly dissapears. It sounds like something is turning off, and spinning down (much like a fan).