HP 459251-001 System board (motherboard) - Integrated nVidia GeForce 8400M GS or Intel GMA X3100 graphics and Intel 965 Express chipset How to check what Motherboard part# you have for HP laptop: 1.Open the memory bay of your HP Laptop at the back of the PC, take out all of the memory modules 2.At the bottom near memory socket there is a white rectangular sticker with "Replace with HP Spare XXXXXX-001" 3. That is the MB Part# you needed. Do not just base order on model# only! If you are not sure, please contact us before order.