I have had my Yoga 2 Pro for less than a week and last night I charged the tablet over night. I just unplugged the tablet and attempted to turn it on, nothing happens. I tried holding the power button down longer and I tried holding the volume down key at the same time as the power and nothing happened. One thing that may be note worth is that the ring around the power button is illuminated. As I mentioned above, the tablet had been charging in the Lenovo sleeve immediately prior to this issue. How can I turn this tablet on?