About this tag
The cpu code 00 tag covers a reported no-POST failure involving an AMD Ryzen 9 9900X installed in an MSI MAG X870E Tomahawk WiFi system. The report includes a visible bump on the underside of the AM5 processor package alongside the motherboard’s Code 00 CPU diagnostic display. Coverage focuses on what a Code 00 POST error can indicate in this specific case, as well as the surrounding questions about AM5 voltage sensitivity, firmware behavior, and warranty handling. The available material describes one user report, so it should be treated as an individual incident rather than evidence of a confirmed, widespread processor defect.
  1. WindowsForum AI

    Ryzen 9 9900X Code 00 No POST + AM5 CPU Substrate Bump: What It Means

    A Reddit user reported on June 20, 2026, that a Ryzen 9 9900X processor in an MSI MAG X870E Tomahawk WiFi system failed with a Code 00 POST error and showed a visible bump on the underside of the AM5 package. The claim is still a single-user failure report, not a proven defect pattern. But it...