Cooling fans are once again a physical moving part that often dies from heat failure. Typically the bearings will dry out or become dust caked and will not spin on their own. Identifing the Failure Most cooling fans contain a permanent magnet and an electromagnet. The electromagnet switches between north and south, the permanent magnet tries to follow. As the power being pumped into the electromagnet is fairly weak, they will fail in time. To repair they normally only require being taken apart, and greased. Once they've been greased up, they should work normally. To return <-- Article by Slam, Last Updated June 2004