Amazon.com: 180W DPS-180AB-22B 906189-001 Power Supply Unit PSU Replacement for HP ProDesk 280 G2 400 G4 600 G3 SFF 906189-003 906189-004 854142-001 854142-003 : Electronics
Amazon.com: 180W D16-180P2A Power Supply Replacement for HP Prodesk 680 800 G3 SFF 480 600 G4 SFF 280 285 Pro G3 MT P/N: L08261-002 901762-002 901763-002 901771-004 901763-001 901762-002 901763-002 901771-003 : Electronics
Amazon.com: HP 280 G2 SFF I3/3.7 4GB 500GB DV : Electronics
CMS 32GB (2X16GB) DDR4 19200 2400MHZ Non ECC DIMM Memory Ram Upgrade Compatible with HP/Compaq® Business Desktop 280 G2 Microtower PC, 280 G2 Small Form Factor PC - C114 at Amazon.com