EATX Power Pins? ATX PSU? Help!

[Tech_Noob_504]

I have a possible compatibility problem between a motherboard (Crosshair VIII) and power supply (Seasonic FOCUS GX-750), which I will link below. I'm looking for opinions to advise me from here.

 

Motherboard:
https://www.newegg.com/asus-rog-crosshair-viii-hero/p/N82E16813119109?Item=N82E16813119109&nm_mc=AFC-RAN-COM&cm_mmc=AFC-RAN-COM&utm_medium=affiliates&utm_source=afc-PCPartPicker&AFFID=2558510&AFFNAME=PCPartPicker&ACRID=1&ASID=https%3a%2f%2fpcpartpicker.com%2fproduct%2fGcfFf7%2fasus-rog-crosshair-viii-hero-wi-fi-atx-am4-motherboard-rog-crosshair-viii-hero-wi-fi&ranMID=44583&ranEAID=2558510&ranSiteID=8BacdVP0GFs-jQ3qqccr6DKKHgBlS2YcZA

 

Power Supply:
https://www.newegg.com/seasonic-focus-plus-750-gold-ssr-750fx-750w/p/N82E16817151187?Item=N82E16817151187&nm_mc=AFC-RAN-COM&cm_mmc=AFC-RAN-COM&utm_medium=affiliates&utm_source=afc-PCPartPicker&AFFID=2558510&AFFNAME=PCPartPicker&ACRID=1&ASID=https%3a%2f%2fpcpartpicker.com%2fproduct%2f64cMnQ%2fseasonic-focus-plus-gold-750w-80-gold-certified-fully-modular-atx-power-supply-ssr-750fx&ranMID=44583&ranEAID=2558510&ranSiteID=8BacdVP0GFs-8hhCfvZ98GhTEQET72loiw

 

My problem started here:
I just finished building a new pc, and was preparing to start it up for the first time. And I did. The motherboard has a convenient display for post code and, after flipping through a series of numbers, stopped on 02 and stayed there. My monitor displayed nothing. I looked up the code and found it was, "AP initialization before microcode loading." Somebody online said this often has to do with some issue with the power pins (That's what Newegg called them, I'm not familiar).

 

So, I checked the power pins on the 8-pin connector and noticed that the shapes don't match up.

 

S = Square slot
O = Other-shaped slot

 

The slots on the motherboard are:
O/S/S/O
S/O/O/S

 

The corresponding slots on the cable are:
O/O/S/O
O/O/O/S

 

Hopefully somebody understands the problem and can point me toward an immediate course of action. I have two theories though, with my limited understanding:

 

EATX pins:
The motherboard manual lists the pins on the motherboard as EATX pins. My PSU is listed as an ATX PSU, and didn't come with any cables that fit these shapes. I was thinking I might need an EATX-specific power supply or cables to hook this up, but the lack of search results makes me unsure if this is even a thing.

 

Intel PSU:
I didn't think PSUs were team blue or team red specific, but Newegg does list this as an "Intel ATX 12 V" PSU, and I built an AMD machine.

 

I don't have enough experience to confidently navigate this problem, so if anybody could lend their expertise to help me cross the finish line and get this pc running, I would be very grateful.

 

 

[Letgomyleghoe.]

I think you switched up your pcie power and eps power. Just try and switch them

[Tech_Noob_504]

Thanks for the response!

 

I checked, and I only seem to have two cables that could possibly work: One labelled CPU, and one labelled PCI-E. The bottom image in the original post is of the one labelled CPU. I checked out the other, the PCI-E cable, here below:

 

 

The motherboard connector has two squares on the upper inside, and two squares on the lower outside. Neither cable seems to match the motherboard slots pin for pin (though the PCI-E one fits my GPU perfectly, as expected. )

 

Motherboard needs:

O/S/S/O

S/O/O/S

 

CPU Cable:

O/S/O/O

S/O/O/O

 

PCI-E Cable:

O/O/S/S

S/O/O/O