Faint lines on Macbook Screen

Hello lewisphillpot,

Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with faint lines on your display. Have you tried restarting your Mac? This simple step resolves a multitude of issues: Shut down or restart your Mac - Apple Support

"Restart your Mac

• On your Mac, choose Apple menu  > Restart.
• If you don’t want app windows that are open to reopen when your Mac restarts, deselect “Reopen windows when logging back in.”"

If that doesn't resolve the issue, let's test this issue in safe mode. Safe mode (sometimes called safe boot) is a way to start up your Mac so that it performs certain checks on the software: Start up your Mac in safe mode - Apple Support

We hope this helps.

Cheers!

Hello lewisphillpot,

It is possible the diagnostics are not able to detect what the issue is.

Another step you might want to take would be to reinstall macOS, per How to use safe mode on your Mac - Apple Support:

If the issue continues in safe mode

If the issue continues while in safe mode, or your Mac restarts several times and then shuts down while starting up in safe mode, you should reinstall macOS and make sure that your Apple software and third-party apps are up to date.

The link in that paragraph provides the steps to reinstall macOS. They do different based on the type of processor your Mac uses. Be sure to follow the proper steps.

If the issue continues after reinstalling macOS, then we would recommend having the device inspected for service. You can find Apple Authorized Service Providers using the Apple Support app on any iOS or iPadOS device.

Have a good day.