Molex connector plugged directly into power supply.
The fan itself has both a male and female molex connector.
My PSU just has a female molex connector.
I'm not entirely sure if I should plug both in or just mate the male with the female on the PSU.
I know it has power since the LED is on, but why isn't this thing spinning?
The fan molex connectors have both male and female molex connectors so that you can daisy chain multiple ones together. Try swapping which plug you use or plugging all the fans together and using one PSU connector. Usually ya can open the connectors and see if they are connected properly....I have had to re-sodder 1 or 2 in my day
It's a Rosewill case so it's basically a "house brand" component. I wouldn't expect much in the way of quality.