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Yes You Did
A MAC address is a unique serial number (of sorts) for ethernet Cards. The intention of assigning a unique address to every card is to aid in identifying computers on networks and the internet. If Two Identical MAC's existed on a network, they wouldn't work.
By changing your Motherboard with an on-board Ethernet port, you changed the MAC address.
You will have to request that MTU generate a new serial number for the new MAC address. I had the same problem, called them and they assisted me.
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