Check the motherboard model printed on the board
Look near the CPU socket
Look between the PCIe slots
Look near the RAM slots
Open System Information in Windows
Use Command Prompt with `wmic baseboard get product,manufacturer,version,serialnumber`
Use PowerShell with `Get-CimInstance Win32_BaseBoard`
Use CPU-Z or similar hardware tools
Check the motherboard box or manual
Check the BIOS or UEFI setup
Inspect the motherboard physically after opening the case