Rattling

[IceDevice]

Pri mentioned before in a post not long ago that using a fan pointed downwards could cause it to rattle. Well, if I'm correct, my fan is only able to be pointed downwards.
Cooler Master Hyper 212 EVO. Really great fan. 120mm. I've had it this way since I got it (Beginning of July 2014). I don't see a solution to this problem, because I don't think I can just stick something in there to exert the pressure downwards. I don't even think that's the problem.
It works perfectly fine, but the rattling is just annoying. It's more of a buzzing.
Any tips, tricks, help? Anything is appreciated.
Thanks!

man I post here a lot...

[IceDevice]

**
Pretty sure it's my GPU fan, only rattles when in a game. Nevermind the Cooler Master.

[NorwegianCraft]

Are there any wires close to the fan?

[IceDevice]

nope.

[IceDevice]

I think it's what Pri mentioned before - stress or too much load or something. I dunno what I'm saying.
I'm running my computer on it's side and the buzzing is gone.