Black screen with coloured lines issue on MacBook Air

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The issue with the lines on the Mac screen can be represented in many different forms and colors. The issue needs to be addressed immediately so it wouldn’t become a permanent problem. Here are some of the reasons that could be causing the issue:

1. Physical damage to the screen

2. Extensive overhearing

3. Damaged or improperly connected cable

4. Outdated or incompatible graphic drivers

5. Hardware problems (graphics card or motherboard)

6. Various software issues

However, to fix the lines on Mac screen, you can try the below DIY fixes:

1. Reboot Your Mac

2. Check Cable Connection

3. Connect Another Display

4. Reset SMC

5. Reset NVRAM

6. Install Graphic Card Updates

7. Reinstall current macOS

Hope it helps!