Roku home screen will not come up. Lights on the box but it won't show the start up
My roku has been cutting on and off in the middle.of shows on its own. I have unplugged and replugged it and usually it come on but today nothing happened. I have tried changing hdmi cords and that's not the issue lights on box is on its just not showing anything. My television seen when I switch ports and cords with the hdmi and it's still saying not signal. Which all in all means it isn't seeing my roku. What should I do?