I'm totally at lost.

There was a sales near where I live. So I bought "Seagate Exos X18 18 TB 3.5" 7200 RPM".
I connect it to my power supply / mother board and here come the issue.
This bad boy does not spin, so I can't see it in the bios.
I was like, okay, probably a faulty one. Before bringing it back to the retailers. I tried it in an external hard drive enclosure and there it start spinning, I can see it in windows, everything fine.

I tried updating the bios firmware.
Plugging it on a sata cable already used by another hard drive so I know the sata cable is not faulty.
Reusing a power cable already used by another drive.
Unplugging all the hard drive except this one , leaving it with the two m2.

So I was like, maybe it's not my job ? Maybe I should admit that I'm not as tech savy as I tought so
I went back to the retailers with my desktop and he told me some stuff about "oh you got two m2 drive ? you should unplug one". My naive self was like "what ? How ? Well maybe he know more than me".
I went back home and guess what, nothing changed, except I have one m2 unplugged on my desk.

And suddently it hit me, but why it doesn't spin ? Even without the data cable it should spin? Am I crazy ?

Here some link : https://pcpartpicker.com/list/bHBht7
PcPartPicker build that say everything is compatible (yeah I'm naive)
Some picture cause why not : https://imgur.com/a/rnymOql

Power Disable Feature (SATA 3.2+ / 3.3):
http://www.hddoracle.com/viewtopic.php?f=46&t=2094

_________________
A backup a day keeps DR away.

omg omg
It really look it's that.
Can I put regular tape on the pin or will it risk catching fire ?
It's 1 am where I live so I cannot go purchase some non conductive tape right now

Some people use a SATA-to-4-pin-Molex adaptor cable. Others just cut the 3.3V wires from the SATA cable.

_________________
A backup a day keeps DR away.