How to fix a hair thin black line across screen

To address the faint horizontal line on your screen that disappears on light backgrounds, try the following steps:

1. Check Connections: Ensure all cables are securely connected. If possible, test with another monitor to determine if the issue is with the screen or the computer.
2. Update Drivers: Update your display drivers and check for any firmware updates for your monitor.
3. Adjust Settings: Experiment with different resolutions and refresh rates in your display settings.
4. Monitor Sleep Settings: If the issue resembles burn-in, adjust your display sleep settings to prevent prolonged static images.

If the problem persists, it may indicate a hardware issue requiring professional evaluation.