S2400SC and one processor Xeon E5 2407v2; install 3 memory module(ECC 16gb or 2gb ) in dimm_a1, dimm_b1, dimm_c1 - in the BIOS, the message: "dimm_c1 Failed\Disabled". All memory module tested in other servers, its ok.
Why only dimm_a1 and dimm_b1 enabled?