No display after new build

I just got a new build, put everything into the motherboard that was needed and the ram wasn't compatible so I put my old motherboard and parts back in with none of the new parts and now my monitor will not recognize the display.

old specs:
Intel Core Duo E8000
GTX 250
8GB DDR2

I had taken pictures before I took the old motherboard out and now I put it back just as it was, except for 1 or 2 LEDs, (Which were pure aesthetics) the way it had looked before and it now does not work.
 
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