Hi I had or I should say have the same problem, but I found out how we can fix it, not permanently but it's better than throwing 100$ screen away plus the phone itself. First time when I encountered with this issue I checked this topic and realized that I have to throw away my nexus phone and new screen which is my second screen that I'm replacing. But don't worry, I'm writing with my brand new screen now :D So after you replaced the screens don't plug the digitizer's cable in, you must use the old (broken) screen digitizer's cable, plug it in and turn your phone on and waite untill the end of booting step, still the new screen is not working but now you must replace cables again, congratulations. Please remember that you should put the sim card in before turning your phone on and if you turn off your mobile you must do all the steps again. That's why I said I found a temporary way to fix it.