Why won't my phone turn back on after the battey died?

[Windows Central Question]

why wont my phone turn back on after battey died

i have an nokia lumna 900. It just goes in this loop of lighting up the buttons then to a white screen or turns on the white screen then trys to start up but stops at the at&t logo then shuts back off. i have had the looping problems before when phone dies but not like this or for this long not to sure if its finally done or what