White lines

Check out this post

https://answers.microsoft.com/en-us/windows/forum/all/apps-will-not-open-and-white-line-appears-under/2418fa92-d691-4b9d-8e7a-bbdd6f1abc3a

Let me know how you get on

Zed

Hi there. I'm sorry that you're having trouble with your Xbox display connection to your TV.

Have you tried unplugging and replugging all the cables on your Xbox/TV? If not, that is a good first step that sometimes relieves the issue. Unplug the HDMI cable from both the Xbox and the TV, then unplug power and all peripherals (Kinect, controllers,
keyboard, etc.) from the Xbox. It may help to do the same for the TV. After waiting a few seconds, plug everything back in and fire up the Xbox again. If the problem is gone, it may mean that a cable connection was loose or a cable is faulty. If the problem
still persists, try plugging the Xbox HDMI cable into a different HDMI port on your TV and check for the problem again. If the problem goes away, it may mean the original HDMI port on your TV is faulty.

If the problem still persists, try using a different video connection from your Xbox to your TV, such as the Xbox component or composite video cable (red/green/blue or yellow RCA cables). If you still see the lines, it may mean that the graphics card on
your Xbox is faulty and it needs to be repaired. Otherwise, the issue may be with the HDMI cable.

Let me know what happens, and hopefully we'll get you back up and gaming soon!

I'm glad it worked. Have a great day!

Looks like unplugging everything actually worked; probably the first time that's worked for me. Thanks for the assistance.

Try making sure the connections are secured properly.