The first thing to try is to make sure the battery is fully charged, it won't boot unless the battery is almost full. Then see if you can reset with the pin in the small hole (use a straightened paper clip) on the left of the SD card slot. Good luck
I did what you said but still had trouble connecting to internet via uverse. I would enter my password that I had set up for security but it wouldn't connect, I remembered that I was given a password from uverse to use with their initial router/modem unit and entered that and I am now connected.I have my other wireless connections hooked up with the password I created ie.. my tablet,DirecTV,roku,and laptop. I thought I was stuck with a door stop but now I am not having any problems.Hope this info can help others with a similar problem.