Some coolers won't start, why?

Question

Iron

Greetings
Today, when starting the computer, I got a problem. The processor coolers and one of the coolers of the system unit do not start.
As practice has shown, if you turn off the processor power, then all coolers work, but the system does not start by itself
Power supply COUGAR GX-F 750W
Processor i7 9700k
Motherboard aorus elite
Video card nvidia 2070
The processor is connected via an 8-pin cable, there is another connector on the motherboard 4 pin, but it is for overclocking. And it was not included with the bp. There are two 8 pin cables going to the video card.
Once this happened during assembly, I just swapped the cables on the power supply side and it worked. Now he doesn't want to work

Answer 1

The cables you described are additional power and they should not be connected to the "rearranged", but to the correspondingly marked connectors.

After your

Understood: you have not labeled additional cables.

Labeled (as an example)

You didn't connect them correctly. Perhaps they need to be connected correctly (left 4 PCI-E, right 2 CPUs, presumably). But it is also possible that the power supply is faulty.

Rightmost cpu, left upper and lower pcie

Connector board

Marking is undefined. The presence of capacitors CM01, CM03, CM05 indicates that the real channels are the middle at the top, right and left at the bottom. Use them. For example, the middle is at the top of the CPU, the right at the bottom is PCI-E.