ASUS Pro WS X570 Ace won't boot with Micron DDR4-3200 ECC DIMM in slot B

This unfortunately sounds like a hardware defect (CPU or motherboard).

Is the co-worker you bought the motherboard from a “dick”?

Otherwise you can ask if

  • You could borrow a CPU from him (if it fixes the issues RMA your CPU)
  • He/she/it could do an ASUS RMA with the motherboard, IF ASUS only does warranty service for the original buyer.

I have bricked my ASUS Pro WS X570-ACE with a BIOS setting permanently and already contacted ASUS support.

There you just type in the SN of the motherboard to create a ticket, I guess since the motherboard cannot be older than the warranty period they don’t ask for an invoice from the original buyer.

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