When I turn on my TV, the Roku box also begins to blink and the ROKU letters jump up and down on the screen. After the normal 10 seconds or so of that jumping, the app used to turn on and give me viewing options. However, now the box simply turns off. I have tried it over and over again with the same results. I have unplugged everything from the ROKU box (power and HDMI cable), waited for a bit and then plugged them back in--nothing works. Do you have any suggestions?