I recently started my 3rd PC build and have never ran into this issue before. I have Rosewill Prism S-Black case and a ASRock AB350 PRO4 motherboard. For some reason I cannot control any of the 4 pre-installed case fans neither through software nor through the BIOS. I have tried using the BIOS and set it to "silent mode" but that did not change the RPM of the fans. I dont know how to attach an image, but I would attach an image of what I think is the pre-installed fan controller if I could. It is on the back of the case and has all of the pre-installed fans connected to it. I have connected the controller to the power supply. I have not connected the VDG plug because the motherboard does not have a connector for it. I'm not sure what the problem is and how to solve it. Is my motherboard not compatible? Do I need to connect the fan controller to the motherboard? Any suggestions?