Troubleshooting HDMI Issues: White Lines and Flickering on PC

If you’re experiencing troublesome white lines and screen flickering when using HDMI on your PC, you’re not alone. Recently, I encountered a similar problem after relocating my setup, which includes a powerful 4080 Super graphics card connected to an LG 42 Flex display. The good news is that there are several potential solutions you can try to resolve this issue.

Understanding the Problem

After moving my equipment, I noticed these disturbing artifacts appearing on the screen when my PC was connected via HDMI. Interestingly, everything worked perfectly when I switched to normal TV mode. This made me believe the issue primarily stemmed from the HDMI connection.

Possible Solutions

Here are some steps you can take to troubleshoot and hopefully resolve the white lines and flickering on your display:

1. Check the HDMI Cable: Sometimes, the simplest issues can cause the biggest problems. Verify that your HDMI cable is securely connected and consider testing with a different, high-quality HDMI cable to rule out any potential faulty connections.

2. Adjust the Refresh Rate: Go to your PC’s display settings and ensure that the refresh rate is correctly set according to your monitor’s specifications. A mismatch can lead to visual disturbances.

3. Update Graphics Drivers: Outdated graphics drivers can cause various display issues. Make sure your NVIDIA drivers are current by checking for updates via the NVIDIA website or through GeForce Experience.

4. Change Display Settings: Sometimes, adjusting resolution and display settings can help. Consider experimenting with different resolutions to see if the flickering persists.

5. Examine Display Settings on the Monitor: Access the settings on your LG 42 Flex. Ensure that any features like ‘Game Mode’ or ‘Motion Smoothing’ are configured correctly, as they might influence how the PC’s graphics are displayed.

6. Test with Another Device: To further isolate the problem, try connecting another device to your LG display using the same HDMI cable. This will help you confirm whether the issue originates from your graphics card or the display itself.

Conclusion

While experiencing white lines and flickering on your PC can be frustrating, these troubleshooting steps should guide you toward identifying the issue. If none of these solutions work, it may be time to consult a professional or reach out to customer support for your hardware. By addressing these issues promptly, you can get back to enjoying your gaming or productivity setup without interruptions.