I've just purchased a pre owned PC and this is my first AMD. Its stock cooler was already installed and I did some research on how to change its colors, but I don't honestly know what to do. It's currently with the rainbow effect, but when I installed Wraith Prism program (by Cooler Master) it says "PLUG IN YOUR CM DEVIDE TO GET STARTED" when I open it.
I'm currently using a 3900x on a B450M Gaming by Gigabyte (I plan on changing the mobo later on). I've seen a few threads on this subject where people advise to leave only the USB cable connected (as seen in my poor ilustration below), but when I unplugged it, the software still doesn't recognize it.