Today, after about 9 months in service, I booted up my DAN A4 and it was performing more slowly than usual. After a reboot, my motherboard was reporting a CPU thermal warning, which quickly led me to discover that my beloved 645LT was no longer being detected. 
The 645LT pump is completely silent on bootup. There do not appear to be any leaking fluids. My motherboard is an Asus ROG STRIX Z390-I GAMING. The 645LT header was initially in the AIO socket. I tried moving it to the CPU_FAN and CHASSIS_FAN sockets, with no difference in behavior.
I've tried vigorously shaking the system in a couple different orientations. Are there any other troubleshooting steps to try before pronouncing my poor AIO dead? Has anyone had any similar experiences?
The 645LT pump is completely silent on bootup. There do not appear to be any leaking fluids. My motherboard is an Asus ROG STRIX Z390-I GAMING. The 645LT header was initially in the AIO socket. I tried moving it to the CPU_FAN and CHASSIS_FAN sockets, with no difference in behavior.
I've tried vigorously shaking the system in a couple different orientations. Are there any other troubleshooting steps to try before pronouncing my poor AIO dead? Has anyone had any similar experiences?
