Can you try what happens if you take out the second card? Try if it works with 4 channels. If that works put the second card in the slot were the first is (swap them out) and try again. That makes sure, that both cards are healthy.
Can you try what happens if you take out the second card? Try if it works with 4 channels. If that works put the second card in the slot were the first is (swap them out) and try again. That makes sure, that both cards are healthy.