I've had my Roku Hisense 4K tv for almost 2 years. I have never had a problem until the other day. It shut itself off and I cannot get it to come back on. The LED light blinks and that's it. I have tried to reset it, I have tried unplugging and plugging back in and I have tried a different outlet. NOTHING is working Hisense support told me to call Roku for an update but can it update if it won't power on