I have a ASrock b450m a/cWhat Mobo do you have, that will tell me what you need for RGB software. On the Asus boards for example the Aura app allow you to calibrate the RGB headers to get the RGB on the pump working. I recently installed a Deepcool 360V2 and had to recalibrate the RGB header to get it shining (lovely cool blue).
MSI etc have their own apps for this too. Also make sure your RGB header is installed the right way round !!!
Cheers
Its not working, pump still doesn't light up.