Macbook Doesn't Turn On After Replacing Screen/Case

Hello Everyone! So I have an older macbook (white) which had a broken screen, and has been sitting around forever due to having my macbook pro. Anyway I decided to replace the screen the other day. It worked perfectly before taking it apart.. I also changed it to a black case while doing the screen and when I began to start the computer up, nothing happend.. I tried resetting the PRAM and SM like listed on the help page, but could my keybaord be not working correcty? It looks burnt under the keyboard... Here are the sympotoms:

No Start Up Chime

No HD Movement

No Beeps

No Status Light

Battery Charges/Magsafe Port Lights Up

I really hope the logic board isn't dead, If it charges does that mean the board it ok? I was wondering if there was any other way to see if the board is ok? I have a used/newish keybaord shipping out tommrow. I'm just worreied about this computer, it was working before and I don't want to spend a fortune on fixing it.. So what do you guys think, or have any suggestions to me seeing if this thing is ok? Thanks for the help! 🙂