nexus 5 won't turning on constantly rebooting at Google

A

AC Question

hi guys, i own a Nexus 5 and today the phone stops working (shut down) and won't turn on ( as a dead phone ), and if i plug it with USB cable, it's constantly rebooting at google for about 2- 3 seconds and reboot again and again, and can't progress, also can't access to fastboot due to restarting quickly