HP 8100/8180 Desktop Motherboard Full Tested With LGA 1156 Q57 DDR3 Part Numbers 531990 001, 505799 002, And 505800 000 From Yycpcs, $33.56 | DHgate.Com
Installing replacement motherboard HP Elite 8100 - YouTube
Refurbished: HP Compaq 8100 ELITE SFF PC, Intel Core i5-650 @ 3.2GHz, 4GB RAM, 500GB HDD, Windows 7 Pro - Newegg.com
HP 505802-001 Elite 8100 SFF LGA 1156/Socket H DDR3 SDRAM Motherboard at TR Reuse Group