I’ve noticed a few people looking for documentation on the motherboard (commonly found in HP All-in-One systems like the HP Pavilion 22, 23, and 24 series). It can be tricky to track down because Pegatron boards are OEM-specific and often don't have a standalone consumer manual like retail boards.
You can find the layout, jumper settings, and port diagrams on the HP Motherboard Specifications: IPMMB-FM (Formosa) Driver Support: pegatron 2ad5 manual link
Slots are numbered XMM1 through XMM4. If you're experiencing "no boot" issues after adding RAM, verify the population order in the BIOS under "System Information". HP Support Community or a specific wiring diagram for the front panel headers? pegatron manual I’ve noticed a few people looking for documentation