Question New GPU is not detected by computer when plugged into a PCIe slot ?

[Loidkrone]

I have made a build with specifications i5-12400, Gigabyte GTX 1080, ASUS PRIME B660M-K D4, Corsair RM650x (2016, from old setup) and the GPU is not at all detected by the computer, not even in Device Manager or BIOS. It works when using a m.2 to PCIe adapter, and I have tested other GPUs in the same slot to no avail. The motherboard only has one PCIe x16 slot.

I have tested 3 other motherboards also. Two MSI motherboards don't POST no matter what I do and another ASUS board has the exact same problem.

I have also tested using a different no-name power supply that I had laying around and still had the same problem. Any suggestions?

 

[stonecarver]

Just wondering from looking at the OP's first picture is he using the correct PCI-E cable in the power supply.

The one to the left that says Peripherals & SATA the cable says TYPE-4 and blurry so does the cable he has plugged into the PCI-E power block also says TYPE-4.

If this is just how the manufacture labels them and if this is fine disregard but if there indeed incorrect he could be popping every GPU that get that wrong plug. Again I'm not sure if just confusing wiring labeling or is this the heart of the issue.

 

[80251]

To be frank, that "flashing" could have contributed to your past particular problem.

Other than the aspect of the OP changing BIOS settings, not really applicable to this issue.

In two separate motherboards w/different CPUs and chipsets? Really?

 

[COLGeek]

In two separate motherboards w/different CPUs and chipsets? Really?

Yes. Those flashings often created all sorts of unintended outcomes. It was a lower model for a reason.

This used to be fairly common, and rarely was it without a catch.

 

[Aeacus]

Again I'm not sure if just confusing wiring labeling or is this the heart of the issue.

RM650x PSU connectors:

Based on that, both "Type 4" cables are connected to PCI-E slots, since top row, from left to right, is: 2x SATA, 3x PCI-E.
And in top row, counting from left, OP has 3rd and 5th cable plugged in. One is for CPU another for GPU.

Another way to tell is counting wires that go into the connector on PSU side. It is clearly seen that 3rd connector has 4 wires on top row (8 in total), which only fits into PCI-E connector. SATA connector has 3 wires on top (6 in total).

"Type 4" is the overall cable type naming for Corsair. E.g some newer Corsair PSUs are using Type 5.

 

[Zerk2012]

Type 5 will not plug into a type 4 PSU and if I remember right type 3 and 4 only differ on the 24 pinout.

EDIT. from just reading everything I think it's a bad board.

 

[Loidkrone]

Just wondering from looking at the OP's first picture is he using the correct PCI-E cable in the power supply.

The one to the left that says Peripherals & SATA the cable says TYPE-4 and blurry so does the cable he has plugged into the PCI-E power block also says TYPE-4.

If this is just how the manufacture labels them and if this is fine disregard but if there indeed incorrect he could be popping every GPU that get that wrong plug. Again I'm not sure if just confusing wiring labeling or is this the heart of the issue.

The GPU is plugged into the 3rd slot (dual 6+2), CPU is plugged into 5th slot (to 8-pin), one SATA power in 6th and motherboard power in last slot. AFAIK it is how they are supposed to be inserted.

 

[Loidkrone]

Type 5 will not plug into a type 4 PSU and if I remember right type 3 and 4 only differ on the 24 pinout.

EDIT. from just reading everything I think it's a bad board.

I'd hope not this is the fourth one I've tried

 

[Loidkrone]

Just wondering from looking at the OP's first picture is he using the correct PCI-E cable in the power supply.

The one to the left that says Peripherals & SATA the cable says TYPE-4 and blurry so does the cable he has plugged into the PCI-E power block also says TYPE-4.

If this is just how the manufacture labels them and if this is fine disregard but if there indeed incorrect he could be popping every GPU that get that wrong plug. Again I'm not sure if just confusing wiring labeling or is this the heart of the issue.

I have checked this but one of the GPUs I tested did not require external power and was still not detected, meaning it's likely not the problem

 

[stonecarver]

I have tested 3 other motherboards also. Two MSI motherboards don't POST no matter what I do and another ASUS board has the exact same problem.

On these other non booting boards are you using the same CPU and memory?

 

[Loidkrone]

On these other non booting boards are you using the same CPU and memory?

Same CPU but I have changed memory out, one of the boards had a debug light saying it was a CPU problem

 

[stonecarver]

Just thinking of the common denominator and the CPU fits the bill. Is your CPU bad IDK but I would not ignore that no matter what board you put it into you get no post or no graphics.

 

[Loidkrone]

Just thinking of the common denominator and the CPU fits the bill. Is your CPU bad IDK but I would not ignore that no matter what board you put it into you get no post or no graphics.

I don't think it's bad, it works completely fine otherwise but it is a possibility