I had to [http://www.myfixguide.com/manual/lenovo-yoga-tablet-2-disassembly/|open the tablet], disconnect the dc power jack connector and then reconnect it. After doing this, then you should be able to plug the tablet back in to power and it should start up.
On my tablet, there was a third hidden screw under the opposite side of the label that I peeled to find the first hidden screw. Be sure that you locate *all* the screws before trying to pry the case open...