I recently purchased a Roku Premiere and hooked it up into the HDMI port of my TV. It went through the normal start up process then said it needed to update. It said it was going to restart after the update and now it just shows no signal. I've tried various HDMI ports, a different TV, resetting it with the button in the back, unplugging it for several days and plugging it back in and nothing. If I hit the reset button the Roku bouncing logo appears then eventually goes back to no signal on the TV. I can see the light on the Roku is on. Help please???