Some users have reported issues with the fan not running. In most reported cases, this has been caused by reversed polarity in the connection to the motherboard. Simply disconnect the fan from your motherboard, rotate the connector 180° and reconnect to the motherboard.
If you are still having issues, the wires may not be making good contact in the connector. Using a small flat head screw driver, press the wire back into the connector, and reconnect to the motherboard.
If your fan is still not working, you may either contact support for a replacement, or purchase a small 12v fan to replace it yourself.