I've replaced my screen before and had no problem everything worked great! Now I'm doing the same thing and now my phone would not power on at all! I do remember I messed with the "Power/Volume" flex cable and the "white plastic" piece came off ... I don't think that should affect it... but if I does please let me know.. and when I connect the phone to the charger... the white LED comes on but still no screen... and I did recheck all my connections ... please HELP!