Thank you for this thread. I can confirm this is not isolated to MSI. I experienced the exact same issue on an ASRock X870E Taichi with a Ryzen 9950X: My system would freeze on a black screen immediately after the BIOS logo, even though Ubuntu booted perfectly. After replacing the default bootloader with Limine, the system now boots Unraid without issues. Since this is now confirmed across two different motherboard vendors, it strongly suggests a chipset-wide compatibility issue with the current Unraid bootloader