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Gday Ross
The fact that yr initial post mentioned "PEC not working" means it didnt fry at that point.
The main board will happily ( well almost ) start up with all the sub boards disconnected, so you can try disconnecting all the headers and then try to boot. If it starts, then the main board is OK.
If not, then it gets interesting.
Does the red panel light come on when powered up????
Can you measure the 5V rail to see if thats working????
Andrew
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