First off, make sure that everythings plugged in as they should be, then try changing your rgb settings using Gigabytes RGB Fusion, you can change it in the bios without having to install anything (available as an option in the bios by default under Peripherls tab > RGB Fusion) or you can install the rgb software for your board model that you can download on the support page for your board. Try it and see if it you can change RGB settings using either method, if not then you may need double check to make sure everythings connected properly.