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I do not have POST-card
but the Mac Pro has this LED that states if EFI loaded correctly
7. Press and hold the DIAG button.
Expected behavior:
• PSU PWROK (green), 5V STBY (amber), EFI DONE (green), GPU OK (green) LEDs illuminated
• No startup tone
• Front and rear processor cage fans (and PCIe fan, if installed) should spin slowly