For people using the Cheyenne Hawk on your own personal (Non-Cheyenne) power supply. You will need this Start Up Facility Power Cord. This happens because the machine is too strong for regular power supplies.
You do not need this Cord, but you will need to set your power supply on 12V. Once the Cheyenne Machine has started running, you can lower it down to an even 5V. With this Cord, you eliminate the hassle of doing such a tedious start up.