Building a computer for the first time. Upon connecting case fans to the fan headers on a Gigabyte 360M H motherboard, I found they would not spin. The CPU fan I connected to the CPU fan header did spin. The case fans I am using are Noctua NF-S12B non-PWM fans. I just need them to spin at their slow speed continuously. Is there something I am missing here? Do the case fans get their power from the fan headers or do I need to plug another cable from the PSU?