Dear Customer,
Would you send us the photos to show how did you connect the lights and DRGB controller to the motherboard? Also please send us the receipt too. This is the email address. You can connect the light directly to the motherboard too, if it doesn't work, it means the LED light in the block has problem.
shopservice@bitspower.com.tw
About the radiator, since you have used it for 4 years, maybe some fin has been broken if the leaking is not from the inlet or outlet. So please check the fin with bubble water and you will find the leaking place.
Any question, feel free to contact us.