Let me know in the comments which pre-built PC this motherboard was hiding in
Look for the small pins usually located in the bottom-right corner of the board. The manual provides the exact pin layout to connect your Power Switch (to turn the PC on) and HDD LED (hard drive activity light).
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Look for a model name printed directly on the PCB, often between the expansion slots or near the RAM slots (e.g., BIOS Boot Screen: Pause/Break
Below are the standard specifications for the most common variants (such as the G31MV-K or G41MXE series) bearing the N15235 mark: