Wont boot PLEASE HELP!!!!

so i had pac rom on my player but after awhile i got tired of the glitches and i just wanted to go back to stock and then root it. i tried using NRT to flash back to stock but its stuck at the boot screen. been on it for the past 30mins

can someone please help me flash this thing back to stock. ill re root it from there, but as of now its not turning on