Originally Posted by Romant
>>> Is it possible the 8th card is damaged/defective?
I have replugged the cards into different slots.
Ok, have you tried 1 at a time? As in test card 1, remove, test card 2, remove, test card 3, remove, etc. ?
Also have you tested all the PCIe slots individually? Working card test in slot 1, test in slot 2, test in slot 3, etc.
It takes a very long time to troubleshoot these kinds of things, but it will prevent you from going insane.