On a random day, the fan in my PSU fan started to make a rattleing sound. Too lazy to pull it out of my computer, i gave it a few good smacks. It would be ok at first, but then it would start up again. Now it's just a loud noise, phasing from one sound to another. I then took it apart and found that if I turned it upside down (the fan itself), it makes a silght rattling sound. Maybe that's the sound and it's being amplified. Anywho.. if anyone could tell me what might be wrong with it or if I could replace just the fan (instead of the entire PSU), please let me know.