Open Box: HP All-in-One PC ProOne 600 G1 (W5Y00UT#ABA) Intel Core i7 4th Gen 4790S (3.20GHz) 8GB DDR3 1TB HDD 21.5" Windows 7 Professional 64-Bit (available through downgrade rights from Windows 10
HP ProOne 600 G1 Repair - iFixit
HP ProOne 600 G1, 22" Display, Intel Core i3-4th Gen @ 3.6 GHz (8GB RA – KenDoTronics