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I just replaced my iPhone 6 screen with one I bought on eBay. The earpiece and home button came installed. After installation the screen is working as in it lights up but it is just a black screen. Phoned it from another phone and it rang. I definitely put the screws in the right place. Tried the home button and power button for 10 seconds. Also put the old cracked screen on which was still working and it’s doing the same thing with the black screen. Help please!