Hello, i have a 420mm AIO Eisbear Aurora Digital RGB running on a Asrock Z170 Fatality Gaming K4, everything works perfect but the pump. It starts and stops in 2-3 seconds cycles. It is an AIO 7-8 months old. CPU FAN 2 port is set to 100% speed and no PWM as much as my BIOS lets me. I also powered the pump from an extrenal power sorce , another PC, and it does the same 2-3 seconds start stop cycle. Any ideas ?