I have an Asrock x99 Taichi with the POST code LED. The board begins POSTing running through different codes. When it hits 4f, it shuts off. I've reseated the CPU and tried different RAM, video card, and PSU to no avail. If I take the RAM out or put RAM in the wrong slots, I can get the board to hang at different places in the POST routine without shutting off. It kind of feels like the BIOS is corrupted, but the backup BIOS does the same behavior (although I guess the previous owner could have corrupted both BIOSes). Has anyone seen anything like this before? Does anyone know what 4f means (Asrock has no useful info)?