Question PSU makes intermittent rattling noise, what should I do?

[Hairen]

I've had this power supply for almost two years and have been using it every day since then in my PC. Throughout me having the PC, I heard a rattling noise that I thought was just the hard drive and never bothered to check if it was because I was satisfied with this answer. I have had no issues related to the power supply throughout me having the PC aside from this noise. When I bump into my desk the noise becomes really loud sometimes, but otherwise its just a casual rattling noise. Is this something I should worry about, and should I try and get it fixed or just get a new power supply when I can?

The psu in question is an EVGA 650w BQ

 

[crazyal]

PSU cooling fan?