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Could be you mangles the ribbon for the power/eject board. Sometimes when you are taking it apart and putting it back together you kink the ribbon cable so much putting it back in, that you actually sever a copper trace in the ribbon. Check with a mitt ether on continuity that each copper trace has a short from one end to the other. If one doesn't have a short, then there is your problem. 99% of the time, you can just trim the ribbon cable back past the bad spot and voila.
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