Hi, i too was rooting the device with Kingo. The software showed that the root was successful but the tablet screen went off. I tried restarting but nothing happened. The tablet seemed to be on as my laptop showed USB device connected.
Then i rest the tablet by pressing the reset button using a pin.
Please search the instruction on how to reset the tablet if you dont know how to do it. I am unable to post any external link to show you that.
Hope this helps... Now i am trying to connect Pen Drives and 3G dongle to the tablet...
I have added a link for that in the first post.
And pen drive will connect if it is not formatted to ntfs(you can download an app from play store for that also )
Please let me know how it goes with the 3g dongle