Sounds like the armature needs to be cleaned. Dirt can build up on the ends of the motor shaft that operates the fan and where it is held in place, the dirt can actually stop the fan. I would spray both ends of the motor shaft with WD40 and rotate the fan by hand until it is free. This is the cheapest thing to do in order to try and get the fan running again. The problem may be worse than this, but it is a good place to start.
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