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Hello Ohjrson,I am unsure if it is the same with the type of fan you are using, but with noisy PSU fans I have done this for several machines in the past -1/ unplug from mains electricity supply2/ undo the cover screws and remove the PSU, then undo the PSU screws and remove the fan.3/ in the centre of the fan is a foil sticker, peel this off, and save for later.4/ in the centre where the sticker was is a flush cover/bung, open this using a needle or fine screwdriver, this reveals a well.5/ drip into the well 2-3 small droplets of white/clear machine oil, as used for sewing machines. (I used a small bottle with needle tip, if the bottle has a larger opening you will need less drops) (ohjrson Made own oil from mix of motor oil and vaseline about 60/40) 6/ turn the fan blades a few times in each direction, leave to soak a short while. (I placed a cleaned diet pepsi bottle cap over the well, on the outside, whilst it is soaking so no dust attracts to the oil)7/ replace the central cover/ rubber bung into the well, wipe any excess off and replace sticker. If needed apply removable gum to affix it, so it can be removed at a future time.8/ reassemble and fan was then silently running.Note - prior to the above I will use an Air duster to remove loose dust, then I use a computer swaps, it is like cotton buds but lint free cloth instead of cotton wool and had wider handles, onto this I spray Digital Cleaning Spray, the blue one, Actually they give you 100 swaps in the pack with the digital cleaning spray, but you can buy extra ones, I then wipe off the blades of the fan and around insides of fan outlet at bother ends in psu, collect out any dust inside the psu unit so it is very clean. Then clean up the mess on desk and begin the fan lubricating process described above.Additonal info , the fans on psu make the noise because the oil/lubricant dries up or contains matter it didn't to begin with, and also dust on blades unbalances the fan, so it causes wear, many fans that are changed due to being noisy just need to have lubricant added, using above method.The sooner lubricant is added when noise begins the less wear will occur as the fan is not running "dry" etc.