Note: "Pegatron 2AD5" appears to be a concise model/board identifier rather than a widely documented consumer product name. Below is a structured, practical discourse assuming the identifier refers to a Pegatron-manufactured laptop or motherboard/mainboard SKU (common in OEM laptop/mainboard naming). I resolve ambiguity by treating it as a Pegatron laptop/mainboard model and provide actionable information useful for owners, technicians, and tinkerers.
If no jumper exists, touch the two CMOS reset pads (often labeled CLR) with a conductive tool (e.g., screwdriver) for 5 seconds while unplugged. pegatron 2ad5 manual