and BTW, my Roku Express was brand new out of the box. So, if this IS the problem, perhaps Roku ought to get themselves different supplies unless they can pinpoint which one of their suppliers is supply **bleep** power cords.
No Roku screen on TV. Just started this yesterday. Have had the Roku Ultra about 4 years, has worked fine. Tried different HDMI cable, tried different HDMI port, replugged the Ultra, repaired the remote... nothing helps. Is it possible that the Ultra device has died. What is the warranty. Can it be refurbished?