Fan not spinning up: Check all connections and check that you installed the fan cable correctly.
Fan spinning at full speed: Check cable from Arduino to fan board, if it is on correct pin, Also check if arduino is powering up. Did you remember to flash the arduino before putting it in?
Arduino not powering up: Check the arduino with no fan modules connected. Then I recommend checking short from fanmod cable to ground or just plug in fan modules one by one and see which one is having trouble. Check if fan on that mod is installed correclty.
iLO Failing to detect the fan: Check connections and wiggle the fan mod around.
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If the steps dont help, contact me!