Ok, TV worked fine yesterday. Turned on today with Roku remote and blank screen, "No Signal". Unplugged everything, powered back up and nothing. Changed HDMI port, tried a different USB port, nothing. TV seems to respond to remote (i.e. volume, on/off), but no video/Roku home page? I can work the Menu functions on TV which makes me think the issue is on Roku side? Every time I unplug the Roku stick from USB/power and restart, same thing... light blinks white, then goes out. From what I keep reading, probably a power source or cord issue? Roku stick is probably 5-ish years old? Next steps?