Yoga 2 Pro - Black screen when on tablet mode

Hi,
2 weeks Yoya 2 pro out of the box, and get a black screen when reaching the tablet mode (back of the lid touching the back of the laptop base).
I try hanged the setting under power management, with no success. When reaching the tablet mode, I get the same result as closing the lid in laptop mode.
I connect my Yoga 2 to a TV through the HDMI and can see the screen and interact with the black screen (not easy to touch the right spot).
My bios is updated and I have Windows 8.1.
Any suggestion???

I found the answer to my problem at
http://forums.lenovo.com/t5/Idea-Windows-based-Tablets-and/Yoga-2-Bios-Update-Crash/m-p/1322487/high...
Now that I found that post I do recall the instructions telling me to turn it off manually when I updated the bios earlier this year. However, the current instructions do not mention it at all, perhaps they should be updated?

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