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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
HP Compaq dx2400 Motherboard LGA775 462797-001 IPIBL-LB E2220 CPU IO/Shield | eBay