Psu Grinding Noise

[Moudilol]

Hi, so earlier today i accedently hit my desk with my knee, and all of a sudden i can hear a grinding noise from my Psu, i checked all the fans, nothing.
I put my pc on sleep and the noise is gone.
It happend twice now, and i dont know whats going on.
I built my pc myself.

I have a really new pc. (2 Months old)
tho i bought my psu used since it was a good deal

Specs:
I7 6700k
1060 6Gb
16Gb Ram
Z Chipset Sabertooth Mobo
Deepcool Aio

PSU: Corsair 600W (Cant remember Model)

 

[velocityg4]

Bad bearing in the PSU fan. When the noise is gone. Check that the PSU fan is still spinning.