Nexus 7 shutdown and not start

One day, my Nexus 7 (first generation) suddenly shuts itself down and I was not able to power it up any more. Charged it over night and it still does not coming back. Search the web and I found this post (post #15 by hiero). The problem turns out to be a loose power connector. Open the back, reset the battery position and reconnect the battery, the tablet powers up just fine.

http://forums.androidcentral.com/google-nexus-7-tablet-2012/233125-nexus-7-wont-turn-no-matter-what-i-do.html