To resolve the issue of a black screen when using video on demand services like VUit, follow these steps:

1. Check Your Internet Connection: Ensure that your internet is stable. A weak or intermittent connection can cause playback issues. You can do this by testing your internet speed or trying to load other websites or streaming services.

2. Restart the Application: Close and reopen the VUit application. Sometimes, a simple restart can fix bugs or glitches that lead to a black screen.

3. Clear Cache and Data: If you're using a web browser, clear your browser's cache and cookies. If you're using a mobile or smart TV app, navigate to your device settings and clear the cache of the VUit app.

4. Check for Updates: Ensure that you have the latest version of the VUit app installed. Outdated software might not function properly. Check for updates in your device's app store.

5. Disable Hardware Acceleration: If you're streaming from a browser, disable hardware acceleration. In Google Chrome, go to Settings > Advanced > System, and turn off 'Use hardware acceleration when available.' This has been reported to resolve black screen issues on some devices - learn more - learn more.

6. Run Windows Troubleshooter: If you're on a Windows device, use the built-in troubleshooter. Go to Settings > Update & security > Troubleshoot > Additional troubleshooters > Video playback > and run this tool.

7. Check HDMI Connections: If you're streaming to a TV, ensure that all HDMI cables are securely connected. Try swapping to a different HDMI port or using a different cable - learn more - learn more.

8. Reset Your Device: Sometimes resetting your streaming device or TV may be necessary. Unplug the device from power, wait for about 10-15 minutes, and then plug it back in.

9. Contact VUit Support: If the problem persists, consider reaching out to VUit support for further assistance. They may have additional troubleshooting steps specific to their service.

By following these steps, you should be able to resolve the black screen issue and enjoy uninterrupted viewing of on-demand content on VUit.