Navigating the circuit layout of the Pegatron 2AD5 is necessary when retrofitting the system with discrete expansion cards or modern Solid State Drives. Expansion Slots
Unless you are trying to clear the CMOS using obscure jumpers or diagnosing a beep code error, the Pegatron 2AD5 is a "set it and forget it" board. Use the HP support site for your specific desktop model , stick to standard DDR3 RAM, and never update the BIOS unless something is broken. pegatron 2ad5 manual