Some owners of the Nexus 7 Tablet PC (models 2012 and 2013 model years) reported that after upgrading to Android 5.0 Lollipop their machine turns into a “brick”. The device simply hangs on loading logo appears at Google, and you have nothing else can be done to him, but to turn it off. Despite the emergence of a large number of complaints, nor Google, nor ASUS does not meet users and has not yet recognized the existence of the problem.
If you have not installed Android 5.0 on your Nexus 7, we recommend that you wait for the official release of Android 5.1. If you have already upgraded to Android 5.0, it is recommended not to turn off the device to not get an error when you restart, and wait for the update. Also, do not put the image manually Android 5.0, if you now have another unofficial firmware.
Hopefully, Google will release an update for the Nexus 7 in the near future and fix the problem.