HP Compaq Desktop PC dx2400(KA538UT#ABA) Pentium Dual Core E2200 (2.20GHz) 1GB DDR2 80GB HDD Windows Vista Business / XP Professional downgrade - Newegg.com
Used HP 459163-001 DX2400 LGA 775/Socket T DDR2 SDRAM Desktop Motherboard - Walmart.com
HP Compaq dx2400 Motherboard LGA775 462797-001 IPIBL-LB | eBay
8GB KIT 4X 2GB for HP Compaq DX Series Desktop dx2400 dx2480 dx2810 dx7300 Microtower dx7300 Slim Tower dx7500 Business PC dx7500 Small Form Factor DIMM DDR2 Non-ECC PC2-6400 800MHz RAM Memory