Samsung Galaxy Note 4 Dark Screen.

Samsung galaxy note 4 screen went dark. Home button doesn't work. Tried holding power and volume buttons, it didn't work. I'm able to hear notifications. Sent it to Samsung's repair center, and they refused to repair because it doesn't have a Samsung battery. On top of it, they cracked and broke my LCD screen. I had to place a UPS claim with Samsung. I will be receiving my phone unrepaired. I guess I will have to repair it myself. Frustrating!!!!