Hello! We have the server Intel Bluff Creek S5500BC motherboard, 16 GB memories and 1 processor. There was a need to increase memory to 32 GB. Bought 4 modules on 4 GB, inserted into the motherboard and she didn't see them. After that exchanged these modules for modules on 8 GB, inserted instead of old and the server gave an error message: "Memory DIMM size invalid". What shall I do?