I am having a similar issue, where I have no video after screen save. It still has sound. I have to hit the reset button on the bottom between 1 to 5 times for it to work. While booting I can see and hear the roku logo, and then it goes to no video
I have the same problem, and the screensaver is already set to the aquarium. No amount of powering off/on will fix the problem. I cannot get the device into a state that will allow me to change the screensaver.