Default [Q] Atrix 2 not booting up seems that it is dead

please help i am in a serious trouble
at first my phone was not booting beyond the M logo
i searched the forum and tried the ReturnToStock method.
i was applying that process on my device , after 5-6 OKAY messages it stopped at a point,the statement `ECHO OFF` WAITING FOR DEVICE is displayed for long i thought something went wrong and disconnected the usb cable.
from then onwards the device is dead and not responding to anything