If the wiring labels on the case are different than the motherboard you will have to pull the wires out of their connectors and reset them so they are right. Sometimes the computer will turn on if one wire for the power button is on a power button connector and one is on a reset connector. As for you video card make sure its seated down on the slot really tight (no brass/gold pins showing) and if your slot has a lock make sure its down.
thepastimer
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