I've being ignoring this for so long, but what to do something to fix it now. I've attached a sound file that will give an idea of the sounds I'm getting from the machine. I'm not sure if it's related to the fans, HD or the RAM cards (they seem quite close to the door and may be rubbing against it). Has anyone had a similar experience? Is it possible to safety have the side panel door open when the machine is on to help locate? Thanks for any replies.