Cooler Master 750w psu buzzing

[meeklo062704]

I think I might have a cause for concern on this psu. I've had it for about a year, and it started making a buzzing noise today. It isn't a constant buzz, it's a quiet short buzz that keeps repeating a little faster than the annoying old school alarm noise. I'm sure it's the power supply because I have a define xl, so it's obviously louder in the psu chamber in the bottom of the case. Has anyone ever come across something like this before?

 

[Dark Lord of Tech]

http://www.youtube.com/watch?v=0wdrQDK388E