That sounds like the Roku screensaver. Or are you saying it's stuck on the Roku boot screen, which has the Roku letters bouncing to a slight musical sound?
If you're stuck on the boot screen, and power cycling isn't making any difference (as it sounds like you've tried), you may need to do a full factory reset. That is done by pressing and holding the reset button for a minimum of 30 seconds (and not one second less). Ignore anything you see on screen while you do that. Once the reset is complete, you'll have to set the device up as if it were brand new.
If it continues to be stuck in the boot screen after a reset, then your device is likely defective and needs to be replaced. Since you have the Express 4K+, you are likely still within the warranty period (one year), so Roku will replace it for you.
Dan
Roku Community Streaming Expert
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