Compaq Presario CQ40 Laptop Motherboard 577512-001 LA-4103P Original Compaq Presario CQ40 Laptop Motherboard **IMPORTANT TECH NOTE: there are several different (and non-interchangeable) parts available for your computer. Please confirm part number and compatibility before ordering Compatible part numbers: 577512-001 System board (motherboard) - Discrete (DIS) architecture, PM45 chipset (v1.2) Accepts DDR2 Sodimm memory