RGBNOWORK

I just built my first PC and to my dismay the RGB fans do not light up, or show up on the mystic light program. Wiring: I have four wires for fan power 3 for the front fans (that are supposed to light up) and one in the back. The front 3 fans are connected to a splitter and I connected that to "JRGB1" on my motherboard (M.S.I B450 Tomahawk MAX) Everything works okay except that the fans dont light up which is why i bought this case, so if u can help plz do