To resolve the issue of EarthCam not going to full screen or displaying a black screen, follow these steps to troubleshoot and rectify the problem.

Check Browser Compatibility

1. Use Updated Browsers: Ensure that you are using the latest version of your web browser such as Chrome, Firefox, or Safari. Outdated browsers can cause compatibility issues with streaming services like EarthCam.

2. Clear Browser Cache:
- Go to your browser settings.
- Locate the option to clear browsing data (usually found under 'Privacy' or 'History').
- Clear the cache and restart the browser.

Adjust Display Settings

1. Disable Full-Screen Mode: If EarthCam is already trying to run in full screen but shows a black screen, exit full screen and try again.

2. Check Display Resolution:
- Right-click on your desktop and select 'Display Settings’.
- Ensure that your resolution is set to the recommended setting for your display.

Update Drivers

1. Graphic Card Driver:
- Go to your Mac’s 'System Preferences'.
- Click on 'Software Update' to check for any available updates which might include drivers for your graphic card.

2. Webcam Driver: If using an external webcam, check for any updates via the manufacturer's website.

Browser Permissions

1. Enable Camera Access: Ensure your browser has permission to access the webcam.
- Go to your browser settings, look for 'Privacy and Security', and check site settings for permissions related to webcam access.
- Make sure that EarthCam is allowed to access the camera and microphone.

2. Check Antivirus Settings: Some security software can interfere with your webcam. Check your antivirus settings to ensure it's not blocking EarthCam's access to the camera.

Test Different Networks

1. Switch Wi-Fi Networks: If possible, try connecting to a different Wi-Fi network to see if the issue persists. Sometimes, network restrictions can cause streaming problems.

Reinstall the Browser

1. Uninstall and Install: If all else fails, try uninstalling and reinstalling your browser. Download the latest version of your preferred browser from its official website.

By following these troubleshooting steps, you should be able to resolve the issue with EarthCam not going to full screen or showing a black screen.

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Update your browser. Clear cache and cookies. Try exiting and re-entering full screen. Check and set correct display resolution. Update graphics drivers. Allow camera permissions in browser settings. Check antivirus isn’t blocking it. Try a different network. Reinstall the browser if needed. If still not fixed, contact EarthCam support.