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I thought maybe the fan was loose in the bracket and perhaps when the motor is energized it shifts slightly and the blades strike the plastic guard around the edge of the blades until that contact for a few seconds kicks the motor and shaft back away from the plastic around the blade. But that's just a wild guess. i kinda' advised them to let it go (it's cooling fine) because if I put a fan in and it still does it, it's going to be embarrassing.