Q: MacBook Pro screen only works on bootcamp! Help!

Recently I replaced my computer's (mid 2012 unibody MacBook Pro) keyboard, and now my internal display doesn't even turn on with OS X, while on bootcamp it Works, with some weird things on it, but Works, the os x doesn't even recognize it, when I connect the computer to na external monitor, I see that only that monitor is recognized by the system. Other weird things are that the image fits the parts of the screen that is ok, the lines and things are not over it, and the max resolution it can be set is 1024x768.

Maybe I damaged the LVDS cable or something like this? What can this be?

This is how the screen looks like on bootcamp and on OS X, as I said, it doesn't turn the screen on.