ROG Strix B850 F - yellow LED for 20sec then red LED permanet

[Pi163]

I assembled a system with the following components:

AMD Ryzen 9 9950X3D

ROG Strix B850 F

2x48GB Patriot Viper Elite 5 Ultra DDR5-6000 CL28

1000W Power Supply

9070XT Graphics Card

After assembling the system (including the graphics card), I powered it on. The case fans started spinning, and the LED lighting on both the motherboard and the graphics card lit up. However, the fans on the graphics card did not spin, and the system did not enter BIOS. A yellow DRAM error LED lit up on the motherboard. I waited a couple of minutes, but nothing changed (I wasn’t sure if I needed to wait longer). I then removed the graphics card and tested the RAM modules individually, swapping their slots, but the yellow LED remained on.

After performing a BIOS update and resetting the CMOS, I was able to access the BIOS using the onboard graphics. I installed the RAM modules in slots A2 and B2, and everything worked fine—even when I enabled EXPO1 for the memory.

Next, I reinstalled the graphics card, but the fans on the graphics card still didn’t spin (the extra power cable was plugged in). This time, the yellow LED lit up again for about 20 seconds, followed by a red LED (CPU) that stayed on continuously. Removing the graphics card didn’t change the error pattern. I still couldn’t access the BIOS, and the red LED remained lit on the motherboard.

I tried troubleshooting further by re-seating all components and checking for potential short circuits on the back of the motherboard, but the red LED stayed on.

My first suspicion is that the RAM modules, though they seem to meet the specifications, cause trouble (they aren’t listed on the motherboard’s official compatibility list). To verify, I’ve ordered some inexpensive compatible RAM modules to test.

Has anyone else had similar problems or has any idea what else I could try?

[Pi163]

Update: I have now installed an 8GB RAM from the QVL. The yellow LED now lights up for 3 seconds, then the red LED lights up permanently again.

[DeadlyGuns]

so if you tested every slot and different RAMs then the problem is not the RAM, did you check if your CPU is ok? Do you see burn marks behind ? Did you also check the PINS on your socket cpu if they are ok or they are bent/pushed back so they lose contact with your CPU? 
P.S. just in case did you also check the PCI-e where your GPU is connected if it presents some sign of burn? The best solution would be to test your CPU and GPU if both are ok and RAM (as you tested) are also ok, then the problem is with the motherboard and you need a replacement... Don't you have a shop close to you where they can test your cpu/gpu ? 

[Pi163 · Accepted solution]

Thanks for your reply!
I removed and reinstalled the CPU, performed the BIOS update again, and did a CMOS reset. After that, the system ran with the 8 GB RAM, even with the graphics card installed. It was probably due to the memory.

[DeadlyGuns]

oh so its fixed now? Probably 96GB of RAM CL28 was too hard to handle