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Turn off your mac, and then charge it for 4-6 hours, and then restart it. The issue might stem from a drained battery, so make sure your Mac is fully charged. If you’ve confirmed the problem isn’t coming from your mac’s display hardware, try the following solutions: Solution 1: Make Sure your Mac is Fully Charged However, if the lines show up in the external display, then the source of the problem stems from other hardware and software defects, including the lack of sufficient space on your hard-disk for regular system operations, broken graph cards, etc. If the external display works perfectly while your Mac’s screen is still a mess, then the problem is definitely from your Mac’s display hardware. The first thing to do is to test your Mac with an external display. What to Do if macOS Shows Multi-Colored Lines on Screen Read on to find out how to trace the root cause of the problem and resolve it. If it’s a software-related problem, it could be a result of

This problem can stem from hardware or software issues. Why is My Mac Screen White with Lines on macOS 10.15? To fix a Mac Book Air that has screen color lines on macOS 10.15, you need to, first of all, identify its root-cause. It can pop up randomly, keeping you in fear of when it’ll show up next, and how long it’ll prevent you from using your Mac.