[AC Question]

so i set my phone on the charger last night and went to sleep...the next morning i woke up,used my phone a little, googled some movie theatres etc. i set my phone down with full battery and then later i went on to my phone and it said youtube has stopped over and over again. so i restarted my phone thinking it will help but it will not start up now, when i hold the power button the phone shows the lg screen and makes the cricket ringtone sounnd on that screen but it repeats this over and over, i tried pulling battery out and still doesnt work. i left it on the charger and still does the same thing, plzz help me out anyone