mobile

I have an xt1039, bootloader unlocker, rooted etc. with 4.4.4. it has been shutting down for no reason more often by the day. i went to a technician and he told me that the battery was fast drained, and below zero. i charged it for 2 days, and it functioned normally. then one day it shuts down and doesnt open no matter what i do. the only response i get is when i charge it the white led lights up and stays like that. my computer doesnt recognize it. what do i do?