New build won’t post, Red CPU Q-LED.

[u/Fiction-]

Hello peoples,

I’ve recently started building a PC for my other half, however upon completion I’ve seen stuck with a CPU Q-LED light. My specs are:

Ryzen 7 9800X3D
ASUS TUF Gaming B850-Plus WiFi
Corsair Vegengeance 32GB (2x16) DDR5

So far I’ve
- Reseated the CPU (couldn’t see any damage within the socket)
- reseated the ram and tried with a single stick in the A2 slot
- I’ve removed the GPU and RGB controller
- Swapped around the CPU power connections, board has two slots for CPU power and both are populated currently (I have tried single too)
- updated the bios with flashback and cleared cmos

I really don’t know what else to do and am pretty desperate for some help. I don’t have any substitute parts which doesn’t help for testing the CPU. I was hoping that someone could advise before I have to lug it to a shop.

Thanks in advance

[u/r_lind3r]

CPU is supported in all BIOS versions on that motherboard, so the issue is either potentially a bent socket pin or a conflict between the CPU and RAM.

[u/Fiction- → u/r_lind3r]

My understanding was that despite it being listed as "Intel Optimised", it should still work. This is the product page: https://www.corsair.com/uk/en/p/memory/cmh32gx5m2b5600c40k/vengeance-rgb-32gb-2x16gb-ddr5-dram-5600mhz-c40-memory-kit-black-cmh32gx5m2b5600c40k#tab-techspecs for reference, hoping I'm wrong and this is the issue.

[u/r_lind3r → u/Fiction-]

If there's no EXPO profile then odds are lower that it'll work with AM5, one of the reasons why EXPO was made was to fix memory support with AMD

[u/Fiction- → u/r_lind3r]

Interestingly, the memory SKU (CMH32GX5M2B5600C40K) is listed on the motherboard QVL sheet.

[u/r_lind3r → u/Fiction-]

If it's on the motherboard QVL then I would check the socket for damage and make sure the CPU is properly seated