Server mining Rig - Only detecting two cards - Unable to enter bios -HELP!

Hey there, I purchased a server mining case from a non reputable seller (Doh!) and it is only detecting two GPUs. The seller is no help and I am unable to enter the bios to tinker. Using CLI in Hive OS I have discovered it is an Intel B85 mobo v5.51 bios but it does not appear that board is supported anymore and I am at a loss for what to do next.
Anyone else have any insight because my brain is spent.