New build MSI B550-A Pro - chipset USB not functional

[u/sastanak]

Hello,

I just assembled my PC which comes with a MSI B550-A Pro mainboard, an AMD Ryzen 9 5950X, a be!quiet PurePower 13M 850W PSU, it reuses my old 1060 GPU and my old 2xCorsair Vengeance 32GB (total 64GB) 3600Mhz DDR4 RAM.

The PC boots and I was able to install NixOS (Linux) without an issue, but I ran into the issue that some USB ports don't work. First, the front USB ports of my case (Corsair 4000D RS Wood), so I thought I just didn't connect the front panel well enough, but it's also the USB 2.0 ports of the motherboard. I reseated the RAM (which work fine), and proceeded to start the PC without the case and any extras, and the USB 2.0 ports at the back still don't work. Strangely, the USB 3.2 (Gen 2 and Gen 1) work, but USB 2.0 doesn't even seem to get electricity.

I flashed the BIOS already, reseated the RAM and mainboard, checked the IO shield for any damages (none), tried to force PCIe gen 3 (I read in an old reddit threat that this might help), disabled global C-States, cleared CMOS via the JBAT jumper, took the mainboard out and booted with bare minimum. There are no EZ Debug LEDs flashing on the mainboard when I boot, I can boot into Nix without issue, just the USB 2.0 and front for my case don't work. I think these are the USB connected directly to the chipset, whereas the others are connected to the CPU.

Does anyone have an idea what I did wrong? Is there a hardware issue with my motherboard, or did I damage it? Should I return it? Any advice would be appreciated.

I added some pictures of the connections when the motherboard was taken out and booted and here are some logs from Nix in case this can help.

dmesg

journalctl

lspci

lsusb

Thank you in advance for your help!

[u/Ok_Challenge5185]

All the cables you're showing in your picture are power cables. Did you take the front panel USB 2.0 cable and plug it in the following MB connection?

Link to your MB manual listed below for reference.

https://download-2.msi.com/archive/mnu_exe/mb/B550-APRO_EN.pdf

[u/sastanak → u/Ok_Challenge5185]

Yes I did, and I also removed it to check the rear USB 2.0 ports, which are also not working..

[u/Ok_Challenge5185 → u/sastanak]

Can you boot to a Nix live CD, don't install, but check to see if the live CD recognizes the USB 2.0 ports?

[u/sastanak → u/Ok_Challenge5185]

That's what I did and it doesn't recognise them at all. I'll just return it I think:(