Like you said if the MB is toast then the machine wouldn't boot or anything else. Generally the only repair would be to replace the MB. Since the machine came back with fresh install of the OS I would guess that the problem was with the HD or the OS install.
If the HD was replaced or wiped then there isn't much to troubleshoot.
Best of luck with this task.
Yours
ZB
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Sodomy non sapiens. : I'm buggered if I know
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