dang...that's wierd...check the power going to the motherboard and make sure the connection is good. Also check the capacitors on the motherboard to make sure they havent blown. I've seen that happen a few times before. Otherwise I would disconnect and reconnect everything again...
if you have already solved this please let us know what it was.
Opus

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Excellent...thanks for updating us on this! Always important to know what you did to fix a problem for others to see!
Enjoy!
Opus