Nexus 5 Stuck on Google logo after putting lollipop

[Gursahib Singh]

Hey guys...in a serious problem.
I was trying to manually update my nexus 5 to lollipop using nexus root toolkit.
Everything happened properly. The flashing was successfull.
The phone restarted but now it is stuck on google logo with a unlocked lock sign...what to do....please please help me out. Really need your help.

 

[Golfdriver97]

Welcome to the forums. I would suggest rebooting into recovery and doing a factory reset.
http://forums.androidcentral.com/nexus-5-rooting-roms-hacks/352008-guide-nexus-5-recovery.html

 

[Felix Ekka]

I have a similar problem. I was using my phone and locked the screen and kept it aside. But then I saw that it rebooted but did't start up completely. It turned off on its own and wasn't powering on even though it had sufficient battery. So I connected it to the wall charger. It's powering on but only for a second ands gets stuck at the google logo. And it won't even switch on without a power source, I tried to get into the fastboot menu but it keeps rebooting every 2 seconds.As soon as I try to select the recovery mode option it reboots. It can't seem to detect the recovery mode for some reason. What should I do now ?

I am running CM12 Lollipop 5.0.2