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2010 Macbook Pro Black screen when posered up.

I have a 2010 Macbook pro.  I replaced the logic board on the computer.  When I go to power it on I hear the post sound the screen kinda flickers then the light on the front fades out and nothing.  I can press the caps lock key and the light comes on and the fans are spinning so i know the machine is running but i get no display.  When I go to turn it off I have to hold the power button for 10 seconds then it turns off. I tried resetting the pram and no change.  Any Ideas?
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Robert Retzer
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I used and External Video adapter and Got an image.  I shined the light through the apple on the back and still didnt see anything so its either the screen or the video cable.