Question Asus z370 A-PRO, designer problem or I got a flawed?

[anemos01]

Hello everyone. I have a very strange problem and of someone can actually find a solution it will be a new frontier for humanity I guess! 🤣

I have:
MoBo: Asus Z370 A-PRO
CPU: Intel i7-8700k 3.7GHz LGA 1151
(basic cpu fan)
RAM: Corsair vengeance LPX (DDR4)
HDDs:
basic Kingston SSD
basic Western Digital Caviar Blue SATA
and the following PSUs for the testing:
Thermaltake Toughpower 850W
GT-1050SG
Corsair TXM850M

I have set up Mobo, CPU and RAM (no HDD added yet).
Connected the PSU on motherboard (24-pin, 8-pin)
cpu fan power cable connected on MoBo.
I power it and look on the screen. Bios loading, everything fine and i can see CPU and RAM on bios.
Then I shut down and connected one HDD ( SSD or SATA one at a time) in any of the SATA slots of MoBo( tried in every slot, and the power cable directly from PSU to the HDD with a 6-pin cable that has sata power connector at the other end.
Now, if i don't put my 6-pin sata cable in the right slot at my PSU(tried with all 3PSUs), the pc won't start.
But if i put it on the correct 6-pin slot the pc will start but will not find the HDD and when i go to bios i can't find the HDD anywhere. Also i believe that this happens because no power is transferred at the HDD as if it had connected the HDD on MoBo without connecting it with the PSU to provide power.
I arrive to this conclusion because when i put my simple SATA (no SSD) I don't feel the classic mechanical vibrations (when I touch it) that I normally feel when the HDD is powered.
The PSUs, the power cables and the HDDs are perfectly fine because when i connect them with other MoBo CPU RAM its loading Windows and it's working.

I've heard theories that my other MoBo is 7th Gen and so my stuff works there because they are old and this one is 8th Gen.
Please help

 

[NanoSuit3]

I don't get what the problem is here cuz it seems your mixing PSU cables or something in my head. Also what's the GPU and have you checked compatibility issues cuz I say first power or compatibility before anything lol.

 

[Paperdoc]

First, it is IMPORTANT that any cable plugged into a socket on the modular PSU be plugged into the CORRECT socket! Merely matching pin count is NOT enough! For example, on the Thermaltake Toughpower 850W PSU, you MUST use on of its three sockets marked "PATA /SATA / FDD Connector" with the CORRECT cable set.

Next any SSD or HDD for SATA connections has TWO edge connectors that you must plug cables into. The wider one is the power intput from a PSU SATA output connector. The narrower one is the data cable that must go to one of the mobo SATA ports. Both are needed for BIOS to detect the unit.

With most current HDD's the vibration of the unit running is very small and may be hard to feel. Moreover, even when that does spin up, it may then stop a short time later if there is no attempt to actually use the drive.

Is the HDD a NEW empty one, or was it in use and loaded with OS and data from before? IF it has data etc, on it, what is the chance it was used previously in a system that was set to the OLD pre-SATA mode of use, and NOT to the current AHCI Mode? See both items under heading 3.6.5 on p. 3-17 of your mobo manual.