Just to share some method ....that might help someone someday
Most times when you have some problem with the Nexus 7. Either version or other tablets... try to do this...it might help........
->Off the Tablet.
-> When the Tablet is fully Off
-> Press-down the power button and Volume +
--> Just hold it till you get into "recovery mode"
--> Clear cache /factory reset
---> clear user data
---> Reboot Tablet
Usually such basic action helps. try not to reflash if its not necessary .
Minor boot-loop cause by installing or certain apps can be solve the way i mentioned.or for some reason, one day, you try to start your tablet, it just get stuck on the starting logo and stays there......
Off the Tablet by HOLDING down the "Power Button" only for about 12 seconds......then do the above action........
However if all your button you press did not restart/reboot your Tablet.
Get the SDK developer software that is available free.............
Once you get the SDK program...........locate in one of the folder a file call "fastboot" . Make a folder name it boot, place it on 'C drive" just have that "fastboot" file...........inside...
Plug your Tablet to your PC .... (always try to have your PC readily recognise your Tablet by installing the coret USB driver. And its good to leave the " USB debugging "checked".
Use your PC go to "command prompt"............
Run "cmd"
Once in the command prompt do a cd to the that c:/boot folder.
Once in directory is c:/boot
Type : fastboot reboot
Your Tablet should shut down and restart...........
Hopefully all goes back to normal
Just to share some info hopefully it helps someone......
BUT if thing get messy - don't blame me haha...........
BUT the above works 95% of the time...for Android phone and tablet of all brands including China made one... also can try..........
All this methods can do experiment.........can try no harm....
can try the "fastboot reboot" even when your Tablet have no problem...
Like a dry run, in case in future you encounter some situation you may have to get your tablet to reboot when for some technical reason, or faulty apps installed ......cause Tablet to misbehave...... the method could help you get out of certain situation.
Cheers.