Try making sure that all the cards are seated properly and verify each card works by itself. In the bios change the PCIe/PCI/PnP Configuration >>CPU1 Slot1 PCI-E x8 OPROM/CPU1 Slot2 PCI-E x16 OPROM/CPU1 Slot3
PCI-E x8 OPROM/CPU2 Slot4 PCI-E x16 OPROM/CPU2 Slot5 PCI-E x8
OPROM/CPU2 Slot6 PCI-E x16 OPROM/CPU2 Slot7 PCI-E x16 OPROM/
Onboard Video Option ROM --- set to EUFI, default is the legacy. Please set to EUFI