I had this happen once with a blu 5.3. And it was because i had it charging on a laptop then because i didn't disconnect it properly the phone turned off and would turn on. I fixed it by letting restarting the computer and letting it sit there eventually about 10 mins later it powered on and i disconnected it properly. The thing i would try is hooking it up to a different charger altogether. See if any lights come on or anything. After about 5mins push and hold the power button. Again wait for lights sound etc. If nothing try a reset. You hold down power+volume up+home OR power+volume up+volume down. Let me know if anything happens.