What can I do?
Hi bro, been noticed this after reading again your first post
I have connected only the 4GB graphics card and still the same issue.
The 4GB graphics card is the only one that it is not working
Have you tried installing only the 4GB graphics card in PCIe x16 slot on mboard? exclude all risers and other GPU's just to isolate your prob
if you already did this and you still got an error, I supposed, you had a bad GPU card