Check the connection of the CPU power connectors.I think you have a mistake here.A Pcie_8Pin_PWR is connected next to the 24-pin connector to increase power to devices connected via USB-typeC.
Usually in such a situation, when a computer with such a problem is brought to me, I remove the processor and clean the CPU contacts with an eraser. Then I clean the contacts with an eraser of RAM.I install everything back into the computer. If the p...
Are your SSDs installed in slots M2.1 and M2.2? If so, they work directly from the processor. If you want to make sure the CPU or motherboard is to blame, move the SSD to a slot working through the motherboard chip, these are connectors M2.3, M2.4, M...