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Observe the fans one by one using your finger to silence them (it's safe and won't cause much discomfort). This might help identify which fan is causing the problem. The AIO pump could also be the source.
I concur, it could be a cable snag or the AIO pump running out of water.
Check the pump's connections and ensure water flow is unobstructed. Verify the pressure settings and inspect for leaks. If the issue persists, consult a professional technician.
I've messed up every fan. That means it's probably the AIO pump.
You have two options: - you can use a volume meter app on your phone and move the microphone around to locate the sound source. Did you turn off the PSU fan as well as the GPU fans? Often people overlook this. - examine your temperatures. A stopped AIO leads to bad heat transfer and can cause the CPU to overheat. You might also feel the tubes and radiator to see how heat is distributed.
It’s my friend’s PC and he mentions it sometimes crashes while he’s using it. He also says it crashes when the glass panel is on because of overheating. I’ve tried using a volume meter, and when I placed it near the radiator, the app reported it was getting loud. I think the issue might be with the AIO cooler.