I was fixing my ear piece the other day, replaced it. I reassembled everything back together and then the screen would not turn back on. I thought it was something damaged in the glass/digitizer, so i bought a new one and just installed it today, but it still wont turn on. the phone can receive calls and even vibrates when i switch from ringer on/off. could the LCD be damaged? it is not visibly damaged. how can i fix this? i already tried to reboot it with lock/home buttons held down.