code 00 on motherboard

[Vermandois]

I’m using an MSI X670E Carbon motherboard with a 7800X3D CPU, and I’m experiencing an issue whenever I reboot the system. The motherboard occasionally gets stuck on error code 00 with red led on cpu and yellow led on RAM. Here’s what I’ve found helps temporarily:

1. Clearing the CMOS (although this doesn’t always work after multiple attempts).
2. Clearing the CMOS with the power completely off for a few minutes.
3. Removing one stick of RAM, booting to let the motherboard retest it, then reinserting the RAM.

The issue doesn’t happen with every reboot. If I fix it and immediately reboot, everything works normally. However, if I leave the system off for an extended period, such as overnight, it will often show the “00” error code on the next boot.

Otherwise, the system runs perfectly. I can stress test it, run games, and handle productivity tasks without any problems. I have noticed some discoloration on the motherboard socket and the back of the CPU, though it’s not in the typical spots where other X3D CPUs have shown burn issues.

[Somerandomtechyboi]

disable xmp see if the issue persists

if the issue persists RMA board as its probably faulty

[Vermandois]

1 hour ago, Somerandomtechyboi said:

disable xmp see if the issue persists

if the issue persists RMA board as its probably faulty

 

Thank you for your response. I plan to test a new RAM kit and current ram kit with xmp off and potentially a new CPU, like the 9800X3D, this week to help pinpoint the issue.

Do you think this could be a priority conflict between BIOS settings and the AMD GPU driver? When loading an overclock profile in the GPU driver, you can choose to apply settings to the entire system (CPU and GPU) or just the CPU or GPU individually.

when I reseat the CPU and let the motherboard reload the microcode last week without loading any profile from the AMD driver, the problem doesn’t occur. and I load the overclock profile last sunday, the problem returns.

[Vermandois]

I believe I've identified the root cause of the issue: the Zen4/Zen5 I/O Die appears to be too sensitive to function reliably with an extension PCIe cable. If I leave the motherboard BIOS settings at default (PBO set to Auto and EXPO turned off), the error is unlikely to occur. However, when the I/O Die is placed under high load—for example, with PBO enabled and EXPO turned on with the extension PCIe cable—the error reappears.