Dell 1950 :pcie training: error internal storage slot

pcie training error slot 1
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Slot: Card present I have 2 Nvidia 980 GTX cards in SLI mode PCI Express Root Port 1 Card not seated properly perhaps? Thank you

XCC Web report warning log of PCIe Link Training Failure when set onboard device to Disabled under UEFI setup

pcie slot cover Getting the same PCIe Training Error: Slot 1, System Halted! as from 3 weeks ago, when I i tried to power on dell power edge r 440 this massege appear

pcie x32 slot Slot: Card present I have 2 Nvidia 980 GTX cards in SLI mode PCI Express Root Port 1 Card not seated properly perhaps? Thank you