In Nexus 5 After Recovery Mode No Option Display

hi

i have nexus 5 .my phone completely working at night.but when i wake up today early morning then my phone automatic start up and shutdown only google and flashing symbol off bubble display.

So i thought to recover phone.but when i recover after that alert symbol with android symbol display then i press volume up button with power button or only volume up button it display nothing..

please tell me what happend to my phone