uriq,
Please provide some more details. Which OS - Windows, some flavor of Unix/Linux? If Windows, which version? Also, which version of the SPP are you running - 2013.09, 2014.02, ... ? Are you seeing the NICs in POST?
There are some known issues with 2014.02 and the Broadcom 1 GB NIC drivers on the DL385 G7's with Win 2008. The other possibility (though I haven't crossed paths with this one myself) is there are some firmware updates that could mess up the same NICs.
HTH
Ken