Hello. The symptoms that you describe almost exactly match a faulty upper LCD. When the ribbon cable going from the upper LCD to the motherboard is damaged or incorrectly seated the console does not operate. Make sure that the connection between the Motherboard and the upper LCD is solid (the connector is on the underside of the motherboard). The ribbon cable should go all the way into the ZIF connector; if you have to, use a spudger or tweezers to completely insert the cable.
Good luck, and let us know how it works out.
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