If YouTube TV is not loading on your Roku device, start by ensuring your internet connection is stable. Restart both your Roku and router to refresh the connection. Next, check for updates on your Roku by going to Settings > System > System Update. If the issue persists, uninstall and reinstall the YouTube TV app from the Roku Channel Store. Clearing cache by restarting your Roku device can also help. Additionally, verify your account access by signing in at tv.youtube.com/start. If none of these steps work, consider resetting your Roku to factory settings or contacting Roku support for assistance.