Thank you for your quick response. Let’s try the following steps,
Please check for bent or broken pins in the video cable connector. Use a different video cable and check if the lines are still visible.
If the above steps do not work, then try the following steps:
Adjust Phase and Pixel Clock controls:
Note: The Phase and Pixel Clock adjustments allow you to adjust your monitor to your preference. If you don't get satisfactory results,use the Phase adjustment, use the Pixel Clock (coarse) adjustment and then use Phase (fine) again.
Glad to assist.