Yeah, sounds like either a loose wire/connector (which you may be able to fix with a screwdriver,) or a bad fan (which is hard to fix yourself, because of the integrated module/heatsink design of the devkit.)
One if the wires in the female connector seems to be loose as the connector seems to be slightly broken. I need to change the female connector.
I found from the reference material that the male connector on the motherboard is 50279-0040N-003 from Aces Electronic Co., Ltd. I could not find the part number for the female connector on the heatsink/fan from the reference material. Does anyone know it?
please do let know when, how, where the connector and/or wire broke.
ensure when you pluck out the connector, do not pull on wires, instead seat the PCB stably, and use two finger nails to pull out the connector evenly.
likewise, when re-inserting the FAN cable w/connector , push on plastic body. after initial guiding it in. do not push on wires to snap the plastic body. also, the male connector terminals are upside visible when plugging into the female connector on board.