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ROG Strix B550-F Gaming Pcie x16_1 GPU no post issue

Level 7


ROG Strix B550-F Gaming

Bios Version: 3002

Case: Lian Li Cool II Mesh

GPU: MSI 3070 Ti Gaming X Trio (EVGA 3070 ftw3 Ultra - card when problem happened)

RAM: 4x16gb 3600Mhz Corsair Vengeance RGB Pro SL

CPU: Ryzen 7 5800X3D (Ryzen 5 5600x - CPU that I had when problem started)

Boot: Western Digital SN570 m.2 500GB (Pcie 3.0 slot)

Storage: Samsung 980 Pro 1Tb (Pcie 4.0 slot)

PSU: Thermaltake Toughpower GF1 750w

AIO: Corsair H150i Elite Capellix 360mm


So I've had this PC built since about December and everything has been super great until a few weeks ago. It is mainly used for gaming and I have NEVER overclocked anything on it. I was using my Meta Quest 2 to play Assetto Corsa with my Logitech G920 wheel and pedals. I ran to the gas station and came back (about a 10-15 minute trip there and back) and when i got back my PC was super slow, choppy, laggy etc.. i assumed it was an issue with the RAM or something so I restarted my PC. It made the sound of starting up through the speakers but no picture and my monitor said no signal. I could only get it to post by installing my GPU in the bottom PCIE slot. (only has 2 slots for GPU) I bought a Ryzen 5 5500 CPU for another build and threw it in just to see if it was a lane in the CPU that was bad and it posted with the GPU in the top slot. I then assumed it was my Ryzen 5 5600x that was causing the problems and purchased a brand new Ryzen 7 5800X3D and then had the same problem as before. still posts with the GPU in the 2nd slot but nothing in the 1st Slot. I also bought a used almost brand new MSI 3070 ti which only works in the bottom slot as well. I have taken everything apart and put everything back together to no avail. I also cannot find anyone with a similar problem. close, but nothing like this. I have also been told that it is VERY uncommon for a Pcie slot to go bad on a motherboard. so I am here to see if I can get any insight before I try to RMA the whole board as it seems that is the problem. Also adding that all of my drivers are up to date.



Super Moderator


Can you confirm the memory kit?

  • Remove the system from the chassis and retest.
  • Clear the CMOS via the motherboards CLRTC header.
  • Inserting one memory module into A2.
  • Ensure all power cables are fully inserted.



If the system still refuses to POST with any GPU inserted into the first PCIE slot then it would indicate the board having an intermittent fault.

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

I will give that a try tonight. I'm not 100% on how to safely test outside of the chassis, but im sure I can find a tutorial somewhere. Thank you!

I’d simply test it on top of the motherboard box. You only need to verify if the system POSTs with the GPU connected to the first PCIE slot

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090