I just got my iMac a yesterday, and have spent all night putting all my work on it; however, when reading the forums, some people said that you can only hear the small hum of the fans. I can hear the small hum from the fans - which is fine, but also, whenever I open something or scroll, or click, it makes a noise like - sorry - crushing beetles. Which contradicts what people have said: that you can only hear the slight hum of the fans; this noise is a lot louder. Here I've booted up the iMac (ignore the clicking of the AF, and the sculling noise at 0:20), otherwise you can here the noise throughout the video. However, it's every time I do anything. Do you have this noise with your iMac? And which model do you have? My model is a 1TB, WDC WD1001FALS-403AA0, which is assume is a Western Digital.