The processor with 4pin power turns on, with 4 + 4pin the bp goes into protection, how to fix it?

Question

Batteries

Hello! Mother bought a new one (msi b450-a pro max), first he connected it to the old power supply unit, which has only 4-pin processor power. I updated the power supply, cut the 8pin power supply, when the power supply is turned on, it goes into protection (it turns on again only after reconnecting to the network, I checked it several times, the protection works well))). At random, it turned out that if you cut only 4 pins, then the computer turns on, and I'm sitting for now.
The new, modular, power supply unit (Chieftronic GPU-650FC) has a 4 + 4 connector made as clumsily as possible: the contacts are not at the same level in depth, this can lead to a short circuit? Or did the feeder break on the mother? Or are the wires mixed up in the cable?
I understand correctly that 4 + 4 pins is one common 12 volt line, a single one, a lot of wires just so that the wires do not heat up, or are these separate parts of the power supply powered by 2 different lines?
Voltmeter is not available now.

Thanks to hint000 for solving the problem:

since the PSU is modular, it is still possible to miss on the other side of the cable. Those. the cable with the inscription CPU can be plugged into the power connector of the video card from the side of the power supply unit.

and to all participants for answering questions.

Answer 1

contacts are not at the same level in depth, this can lead to a short circuit?

No. Not for nothing that each pin is surrounded by an insulating fence. The fact that they are not rigidly fixed and wobble should not bother you, this is done on purpose, to facilitate centering when inserted.

I understand correctly that 4 + 4 pins is one common 12 volt line, a single one, a lot of wires just so that the wires do not heat up, or are these separate parts of the power supply powered by 2 different lines?

You understand correctly, all wires of the same color are stupidly paralleled. This is easy to confirm with an ohmmeter.

Or are the wires mixed up in the cable?

Yes, this can lead to an observable effect. But it's too unlikely. For this to happen, there must be some kind of your personal ill-wisher capable of sabotage, and he must have a special tool for squeezing contacts out of the connector.