To insert a fan unit:
1. Make sure the mating connector of the new unit is free of any dirt and/or obstacles.
2. Insert the fan unit by sliding it into the opening until slight resistance is felt.
Continue pressing the fan unit until it seats completely.
Important
Upon first installation, the green Fan Status LED should light. If
not, extract the fan unit and reinsert it. After two unsuccessful
attempts to install the fan unit, power off the system before
attempting any system debug.