I am experiencing the same problem. I have not moved my Roku 3 nor do I have an SD card installed in the device. However, it is stuck on the Roku dancing screen. I was away for about 2 months and do not know if power was lost at any time during those 2 months. I have conducted the hard reset and held the button for 40 seconds to make sure, but there was no reset. I have unplugged the device several times, still no success. Does anyone have any further advice? For now I am using my Apple TV which is working perfectly! Maybe I'll just eliminate my Roku.