If you own a HP Pavilion dv6100, dv6200, dv6300 or dv6400 series laptop and are in-need of a motherboard, I can help you. The HP replacement part number your going to want to buy is 434723-001 which HP details as "PC System Board : Intel 945GM Chipset - Without Memory - Full-featured (FF) Motherboard".
434723-001 was specifically designed for the models listed above: dv6100-dv6400 HP Pavilion Series.
HP 434723-001, LGA 775/Socket T Motherboard
Sale Price: $19.99 on eBay.com