I have this same problem with my note 4. I dropped it face down on the screen, surprisingly the screen did not break. It has power, the top left power light and two bottom icon lights are on it still vibrates indicating messages it rings for incoming calls I can answer them because I know where to swipe to answer call, but I cant see a thing completely black screen. I have the finger swipe security that I can still unlock but nothing visible. Ive tried the soft reset holding down power button for 2 seconds to drain power and removing battery for 10 minutes but it has not worked for me. Please Help.