So my phone went out of warranty and the LCD was cracked. I was able to successfully replace the screen myself, but now when I power on my phone the screen displays the apple logo then just turns off. The Phone tries to start up for about 20 seconds then just quits. I have tried plugging the phone into the wall and into my computer. Both of which cause it to turn on, but the phone still does not complete start up. The phone was working perfectly before I replaced the screen. Any ideas?