msi B550 gaming plus ez debug cpu led on

[stef44]

Good evening everyone! I need your help about a problem i am facing. I have bought these following hardware parts:

M/B MSI B550 gaming plus
CPU Ryzen 9 5900X
RAM 32GB kit DDR4 3200MHz
PSU EVGA 750W Gold 80+
CoolerMaster ML240L V2 RGB
GPU Radeon 6700XT 12GB
Case Corsair 4000D
The problem is that the CPU led in the ez-debug is steady on and it doesn’t give any signal on the monitor. I have tried to reset the bios, i have checked the pins of the CPU and replaced it again in the socket, i have changed cable from the PSU to the 8-pin CPU socket on the motherboard, i have tried to update the BIOS through flash BIOS update with a usb stick following a video on youtube, i have de-assembled all the hardware parts from the case, i have powered it without the gpu on the m/b in the pci-express 4.0 and i have also tested the PSU in another PC (works fine). My mind is almost out of ideas. Of course i have checked the compability of all parts before buying them. Can anyone help me?

Thank you for dedicating your time to read this!

[phillpower2]

Are you aware that a BIOS update may have been needed to have been done before the boards BIOS can recognise the CPU, the CPU LED staying on supports the possibility, the board ships with BIOS version 7C56v10 from 2020 whereas the first 5th gen BIOS update is version 7C56v19 for the Ryzen 7 5800X3D which is dated almost two years later at 2022-03-23.

PCPartPicker flagged up such a warning here

[stef44]

Hello and thank you for your response!

Of course i have tried to find a solution before i got your response. Here’s the steps i followed:

I tried with another RAM kit i have (RAM 32GB kit DDR4 3000MHz instead of 3200MHz i had during the assembly) and the PC worked fine! Seems that the problem solved! But unfortunately i faced another problem. So my first thought was the XMP profile that maybe wants to set manually the speed of the RAM. But it wasn’t that.

I installed windows 10 on an m.2 kingston 500GB (through a flash USB made with Creation media tool) that i placed on the motherboard, i installed all the drivers, some programs i need, everything’s fine! I tried then to shut it down, and it doesn’t. I tried to restarted and it did. But, i forgot the flash usb with the OS on the motherboard and it tries to boot from it. “Ok” i said, lets change the boot priority and place the m.2 with the windows installed as option 1 and we’re fine. And it doesn’t boot.

Fun fact: I tried some minutes before the RAM with the 3200MHz speed in an another PC, since i believed that these had the problem, and they work properly.

Started thinking that something is going well with the motherboard.

Thanks again for your time!

[stef44]

Problem solved! Hardware issue with the RAM kit. I checked them with memtest32 and it found an error. I changed them with a new kit with the same characteristics and it is working fine!

Thank you for your time everybody!