How do I fix the start up screen?

My Kindle Fire suffered an abnormal amount of weight falling on top of it and a fall from a short height onto a concrete sidewalk. Ever since it happened, it won't boot up correctly. I can't find any way to fix it. When it boots up, half the screen is black, while the other half is gray with many colored lines appearing and disappearing close to the power button. The screen has NO cracks or breaks. If anyone knows how this can be fixed, then please share with me how it can be done.