Replaced Screen/Case Now Doesn't Turn On

Hello Guys! Just wondering if you can help me out.. So i had my old macbook which was white and I decided to switch it over to black due to my screen was cracked and it worked fine... So i put everything back together and nothing happens... I also put a new battery into it (Don't know if that has anything to do with it) but nothing seems to happen when I push the power button on the keyboard (Maybe it's broken due to pulling it off?) It's pretty burnt on the underside.

I already went through the reset procedure on the apple site, but it makes me believe if the keyboard isn't working, it wouldn't even be possible to do it. I also took out the RAM and tried starting to listen to a beep but nothing seemed to happen. (BTW It Charges) I have a new keyboard coming but I wanted to know if there was anything else I could try to wonder if something is wrong or bad.. Thanks for the help.

- Possible Problems?? -

*HD Failure
*Logic Board Failure
*Screen Issue?

So what you people think? Any suggestions, I want this thing running

 

Well I'm using the old keyboard as we speak and it seems to be not working, that's why I ordered a kind of new black keyboard.. But I just don't understand, it has to be the keyboard because it was working a day prior to replacing the screen.. I hope this old keyboard is just broke Thanks for the input

 

It's a white cable.. How can you start the macbook without a keyboard, i might have to google this.. Thanks again