https://drive.google.com/file/d/0B5K2oNt3rWwBSFFXbVRONHlETS1tZmZxNEpnWEpwZ05yb2NJ/view?usp=sharing That's how it sounds. It did this about a month ago and I took it out and then put it back in thinking the problem was another fan, but now it has just started doing it again and it's quite loud as you can hear.