Because of two defective power supply units, I almost gave away a perfectly working mainboard. The system shut down intermittently during idle time. This was with a Corsair AX860I which would power off and shut down the system. I changed the CPU and then the GPU. Still had the same problem. Then I replaced the power supply with a Corsair AX1200I. Same problem. I thought I had a bad motherboard. Tried a different motherboard. Same problem. It's hard to believe that my two high-end power supplies have failed. Changed to a cheap 550w HEC PSU I had. Problem solved. Ordered this PSU while the system was working with no issues. It runs quietly and I like that the fan doesn't stop completely, but rotates very slowly. My water pump is now the loudest part in the case. System Specifications โ MSI B550m Mortar / Ryzen 9 3900x / Nvidia 2070 Super / 2 โ 1TB M.2 drives / 1 โ 1TB WD HDDs / 2 โ 200GB HDDs โ Swiftech 240mm water-cooled heatsink and pump MCP55x / 6 โ 120mm RGB Fan / 1 - 200mm RGB Fan.
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