Droid Turbo has sound but no lights or screen, how can I fix it?

[AC Question]

My Droid Turbo was acting funny and it would show a partial screen but not let me turn on or off or even use the touch screen. It finally turned off and now it turns on but I only get the start up sound, no lights or screen light up and then it vibrates and will start all over again! PL:EASE HELP!!! My life is on this phone!

 

[belodion]

Perhaps it needs a new battery?