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Problem with RGB header

Level 7
Hello everyone!
I have got an ASUS Z370-A Prime and I have connected a CoolerMaster MasterLiquid ML240 RGB to the RGB header. Everything was working normally. Some days ago, I realized the the blue colour has stopped working. Only red and green were working. I disconnected the cable from the header and I connected it to the standalone controller of the cooler and the blue colour works normally. So, the problem is on the header. It does not provide blue colour. I downloaded the Armoury Crate, but it was always freezing during the istallation and in the end it meshed up the whole os. Afterwards, I installed the older Aura Sync Utility and I tried to calibrate the header. The red one is ok, the green one is ok, but whenever I choose the blue one, no light from the cooler. Is there anything I can do to fix it?
Thaks in advance!