have recently got a replacement scan 450 wt ctr quiet psu. been fine except i have been getting an intermitant hum/buzz coming from it after about 1-2 hours use.

do these make a noise or is it again probably faulty??

i will check to see if it is my new arctic coller graphics card fan but it's coming from the top of the case at the back where the psu sits.

it's a cheiftec BX case.