There is an odd "revving" noise coming from my XPS8300.
I believe that this is the power-supply fan.
I have airdusted and cleaned all the fans, however the noise is still there.
It's not constant, it comes and goes, lasting from a couple of seconds to minutes and it has nothing to do with CPU usage. For example sometimes I'm not even using it and it will still make that noise.
I have had this problem before, maybe a year ago and it went away by itself however now it returned and it won't go away no matter what I do.
Please advise, should I be replacing the fan? or the PSU?