This is usually caused by a failed update, or some type of crash. Try resetting the Xbox by holding down the power button for 10+ seconds to turn off. Then turn it back on.
You could also try the "Troubleshoot" menu --> Hold the "BIND and EJECT" buttons for 15 seconds to start it, you should hear two chimes and it should start into a troubleshoot menu. There is an option to reset it, or do an "Offline system update", you'd need a USB stick for that.
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