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No, it's helpless.

OK....thank you for looking into this

(01-20-2023, 02:23 PM)DeathBringer Wrote: [ -> ]I can't help without information of POST-card.

what sort of POST card do you have in mind?

generally POST cards dont do anything in a Mac, they run their own EFI Firmware that does not generally output any traditional postcodes 

so im not sure how much use a POST card would be sadly

but as per my first post I suspect its a max multiplier issue, so thats something to look into perhaps?

Apple EFI Firmware has a code with writing in port # 80h.