[What is this sound?]

I can't tell from that whether it's a fan hitting something or the pump, nor could I see the screen. I'll assume you got either a CPU_FAN boot error or a CPU temp warning on the BIOS screen. With or without the noise, it is likely you don't have any flow and the pump is not moving fluid. If you are still in the warranty period, contact Corsair Support. Otherwise you probably need to go shopping.

Hello, fan is not hitting something, its the pump. On the screen it was CPU temp error. When i place the pc horizontal (like in the pic) pump works fine, but when i place the pc vertical (like in the video 1st post) pump is not working and making wierd sound. Thanks

[What is this sound?]

Hello, whenever i cleaned my PC, h80i v2 makes this sound.

The CPU goes very hot like 80 90 c. Any idea what's going on. All connections are correct, thermal paste is new and quality. Thanks

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[H80i v2 Thermal paste problem]

Hello, im using H80i v2, i renewed thermal paste. Its worked properly for 5 mins but after that its over heated and when i checked the thermal pastes its all melted. Is anyone have the same problem. And do i need the check the water for pupming system. If yes how?