Laptop Won't Boot

I have a Dell Latitude D800. I just changed the system board but the system won't boot. When I plug the ac adapter into the system I see the battery charging LED come on and stay on continuously while charging. However when I hit the power button all of the led indicators come on and shine green for about two to three seconds and then the system just cuts off. I never see a Dell splash screen. No Bios screen. No flashing cursor. Any ideas where I could start with this? Any and all help is appreciated because I really need this laptop working.
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  1. When you changed the system board, did you do the following?

    Enter the computer Service Tag into the BIOS of the replacement system board.

    Insert the floppy disk or CD that accompanied the replacement system board into the appropriate drive. Follow the instructions that appear on the screen.

    For more info, here is the link to the manual -
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