Found this on an android forum when my 10.1 tab a wouldn't turn on. Press and hold power and volume down button together. release volume down button, and the unit should then power back up. Mine shut down last night sometime, and would not power back up until I tried this after finding out about it on line. Another suggestion that works for some people is to push and hold the power button while keeping a finger on the screen till it powers on.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
No reputation gained yet.