Originally Posted By: chaosmagnet
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Use a paperclip or some other object to carefully prevent fans from spinning on a shut-down and unplugged computer when the air might spin them. Some fan bearings will break if you spin the fan the wrong way too fast or too long.

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<endlurk> Apologies if I'm late to the party, but I wanted to add that spinning the fans too fast in either direction can damage them. <resumelurk>