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I've used WD40 in the past but prefer using a silicon spray these days.
Spray into the crack between the moving and not moving pieces.
If lubricating does not work or if the fan movment is not free (spins easily), remove the fan and take it to places that may sell a replacement.
I have got power supply fans to work well that would not even turn by removing them. Soak in hot dish water (really soapy). This will break up and remove crud that gets in the fan from years of cig. smoke, cooking oils, dust, etc.
Rinse, let dry, oil the shaft and bearings (or silicon spray), replace. I have done this to my own machines so I know they are still working years later.
Spraying does not always work on the little fans. Some are very cheaply made, I guess.
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