A few "Cooling Fan Manufacturer" fixed limit its blades rotate together, if the fan and electronic components are not damaged, limiting the rotation of the component is loosen the fan can rotate automatically restarts.
2 small current, or with Auto start function "Cooling Fan Manufacturer", in the power-rotating fan blades locked state, continued 72 hours after release is locked blades, the fan automatically and immediately re-turn, prove fan no exception.
3 large current or without Auto start function "Cooling Fan Manufacturer", not long locks, otherwise the fan will overheat damage.