My bedroom Roku 3 has worked great for the past several years but suddenly the picture started fading in and out and finally a "no signal" blue screen. I assumed it was the Roku as they don't last that long. Substituted another Roku in it's place but the same problems existed. My TV is a cheap Sieki so I thought it might be a faulty HDMI input. I ruled that out when the DVD player worked fine on that input. With no other options to try I exchanged the original HDMI cable for a new one and bingo problem solved. The HDMI cable was the last thing I thought would fail. It was not bent, crimped and never touched plus it's connection was solid. Lesson learned.