i followed the ifixit guide to replace the screen. Upon completion, i went to turn phone on and it would not turn on. Thinking that i did not properly connect battery i re-connected the battery. tryed to turn phone on again, and with much dismay still no power. hooked the phone charger up to it and it vibrated but still no power. i am at a loss as what to do or what to check. and yes i made sure that the sleep switch was off.