AMD 570/580 mining Ethereum

Hey everyone!
I currently have my rig (4 AMD 580 cards and 2 570 cards) and Hive OS will only recognize that I have 5 cards. The other issue that I am running into is that card number 5 is not hashing where it should be which is around 28MH/s. The card is not hashing at all. Any advice and tips on curing these two issues? I have cleared the overclock settings on all of the cards and taken them back to factory default. I have checked the cables and moved the risers around to see if it is a riser or cable issue. I am completely lost as to what to do. Any help is appreciated.