Question New Ryzen 7 9800X3D Build Won’t Boot — CPU & RAM Debug LEDs On (Need Help)

[elvis_yk]

Hey everyone, hoping someone here can help me out. I just finished building my new PC and I can’t get it to boot. No signal, no POST, nothing. The debug LEDs on my MSI board show both CPU and RAM errors — and I’m running out of things to try.

🔧 My Specs:
CPU: Ryzen 7 9800X3D
Motherboard: MSI X870 Gaming Plus WiFi
RAM: Kingston Fury Beast 64GB DDR5 6000MHz CL30 (KF560C30BBK2-64)
Cooler: Arctic Freezer II 280 AIO
PSU: be quiet! Pure Power 12 M 850W (also tested with another PSU)
GPU: Not installed for testing — using basic boot config

❌ The Problem:
System turns on, fans spin, AIO runs — but no display or POST.
CPU and RAM debug LEDs stay lit on the motherboard.
No BIOS, no beeps, no signs of booting.

✅ What I’ve Tried:
Booting with just CPU, 1 RAM stick, no GPU or drives
Swapped PSU with a known working one
Reseated CPU, checked cooler pressure (not overtightened)
Tried both RAM sticks separately in different DIMM slots
Cleared CMOS several times
CPU and motherboard were tested by retailer — both confirmed working
BIOS version should support the 9800X3D out of the box

Chat-GPT Theory:
I’m thinking the RAM might be the problem. It’s 64GB (2x32GB) at 6000MHz CL30, which is dual rank and pretty aggressive. I know X3D CPUs can be picky with memory training, especially with non-QVL kits. Could this be why both CPU and RAM LEDs are stuck on?

📩 Looking For:
Any other ideas before I buy new RAM just to test

Thanks in advance — any help is massively appreciated.

 

[Lutfij]

Welcome to the forums, newcomer!

The debug LEDs on my MSI board show both CPU and RAM errors
Did you inspect the CPU's socket for any bent or broken pins? Rams populating slots A2 and B2 on the motherboard?

RAM: Kingston Fury Beast 64GB DDR5 6000MHz CL30 (KF560C30BBK2-64)
https://www.kingston.com/datasheets/KF560C30BBK2-64.pdf
I don't see AMD's E.X.P.O mention on the spec sheet for the ram kit and it's meant for Intel platforms. If I were in your position, I'd swap the ram kit out for one that has AMD's E.X.P.O advertised on it.

Motherboard: MSI X870 Gaming Plus WiFi
+
BIOS version should support the 9800X3D out of the box
You can try and flash the BIOS with this guide;

View: https://youtu.be/Hf_NdVRk37E

to make sure you're not running into a BIOS compatibility issue.

 

[elvis_yk]

Welcome to the forums, newcomer!

The debug LEDs on my MSI board show both CPU and RAM errors
Did you inspect the CPU's socket for any bent or broken pins? Rams populating slots A2 and B2 on the motherboard?

RAM: Kingston Fury Beast 64GB DDR5 6000MHz CL30 (KF560C30BBK2-64)
https://www.kingston.com/datasheets/KF560C30BBK2-64.pdf
I don't see AMD's E.X.P.O mention on the spec sheet for the ram kit and it's meant for Intel platforms. If I were in your position, I'd swap the ram kit out for one that has AMD's E.X.P.O advertised on it.

Motherboard: MSI X870 Gaming Plus WiFi
+
BIOS version should support the 9800X3D out of the box
You can try and flash the BIOS with this guide;

View: https://youtu.be/Hf_NdVRk37E

to make sure you're not running into a BIOS compatibility issue.

Yes

Welcome to the forums, newcomer!

The debug LEDs on my MSI board show both CPU and RAM errors
Did you inspect the CPU's socket for any bent or broken pins? Rams populating slots A2 and B2 on the motherboard?

RAM: Kingston Fury Beast 64GB DDR5 6000MHz CL30 (KF560C30BBK2-64)
https://www.kingston.com/datasheets/KF560C30BBK2-64.pdf
I don't see AMD's E.X.P.O mention on the spec sheet for the ram kit and it's meant for Intel platforms. If I were in your position, I'd swap the ram kit out for one that has AMD's E.X.P.O advertised on it.

Motherboard: MSI X870 Gaming Plus WiFi
+
BIOS version should support the 9800X3D out of the box
You can try and flash the BIOS with this guide;

View: https://youtu.be/Hf_NdVRk37E

to make sure you're not running into a BIOS compatibility issue.

i will try returning the ram and getting one meant for amd that's the only thing i haven't tried