I recently bought some new DDR3 RAM (2x4GB) to add on to my old system. It has been using 2x4GB Patriot 1866Mhz RAM since I originally bought it some time ago, so I wanted to add two more RAM modules to have a 4x4GB. When I tried to add the new RAM I just got, the PC wouldn’t post. It posts with 2x4GB old RAM, but doesn’t post in any other configuration, not even just one stick of the old RAM. All 4 slots work since it posts with old RAM modules on slots 1 and 3, and on 2 and 4. Does anyone know why I’m having this issue? Thank you guys in advance!