Dead CMOS battery or short circuit. Manual fix: Replace CR2032 battery. Check motherboard standoffs in the case – extra metal touching the board causes shorts.
This board was designed for the LGA775 era, supporting a range of classic Intel processors: The Retro Web CPU Support: Intel Core 2 Duo, Pentium D, Pentium 4, and Celeron D. ATI RC410 (North Bridge) & ULi M1573 (South Bridge). 2x DDR2 DIMM slots supporting up to Expansion: 1x PCIe x16, 1x PCIe x1, and 2x legacy PCI slots. 4x SATA I ports and 2x IDE interfaces for older drives. Integrated Graphics: Radeon X300-based onboard video. The Retro Web 🛠️ Manual & Installation Tips rc415t-am motherboard manual