Remove micro SD card. Restart system - unplug/plug back in. System should start and when finished, reinsert SD card to allow the system to remount the card. Restart system when finished. System will take slightly longer as it remaps the SD card and you are then good to go.
Hello, I just had the same endless rebooting with the music and tapping. I removed The microSD card and problem solved! The installation of the card is suggested by the Roku itself because of a lack of internal space and for a place to for apps to be installed. There’s was nothing wrong with a microSD card previously. I just plugged it into the computer and there was the initialize option. So the card seems to be corrupted because of the Roku 4. Now what to do with the micro SD card slot as a place for additional storage?