MacBook Pro does not work

I am very frustrated. To make a long story short, my dog knocked down my macbook and it got destroyed. I purchased all the parts on Ebay .   i bought all the parts on ebay. Here is the issue. The parts i purchased from ebay are brand new and work. the last issue that i had was with the keyboard. so i bought a new keyboard replacement from factory brand new.After installing the new keyboard, i do not know what happened to the laptop but it does not work properly anymore.
Here are the issues:
1. The computer becomes overheated very fast
2. the computer takes a long time to load when starting
3. the keyboard does not work
Here is another issue: the airport card is brand new yet the system does not pick it up.
The computer worked perfectly until i replaced the old keyboard with the new one.
i tried to do a diagnostic and it does not work. the computer freezes during the diagnostic. it does not finish and the computer overheats. feel so frustrated.  i was so close to finally fixing my laptop. i am lost.
macbook pro unibody mid 09 a1286. not sure about the operating system.

Do you have a wired keyboard?
"Yes, the keyboard works. It powers the computer, however, the keyboard keys don't work."
So the power button works but the keyboard doesn't.
Pull the connector to the keyboard and start the computer using the power pads as below:
http://www.insidemylaptop.com/turn-on-macbook-pro-laptop-without-power-button-lo cating-power-on-pads/
Be very careful doing this. Carefully identify the power pads and only touch them.
"macbook pro unibody mid 09"
size?

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