Similar to [this question](http://android.stackexchange.com/questions/39548/red-notification-light-on-nexus-4-wont-power-on-device-unresponsive) except my LED light is solid blue.

I've googled the subject but the only thing that came up associated with the blue light was the Facebook app, which I don't even have installed. I can't say I remember ever seeing it before.

The battery was not low. The phone was unresponsive and, though off, the screen felt unusually hot. So I pulled the battery out and let it cool down. The battery's back in but it still won't power on.