I have a very similar problem my fan Riing14 was only changing colour when the PC switched on. But now it is stuck on red. I only put it in an hour ago but I have now tried a molex to 12v converter but it is still stuck on red and at full power. I had to connect it back to pwm fan header just to make it quiet again. Do you think they would send me a new controller? It is fitted and has a glorious red glow, which is lucky as my primary scheme is red and black. None of the buttons do anything but I can control the speed with the Motherboard (hero v11).