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horizontal line on mac screen

my mac has 3 horizontal lines across top of screen, it popped up when opening safari then disappeared when i close the app. Only for it to stay after reopening the safari app, the lines are not going away! help

MacBook Pro 13”, macOS 10.15

Posted on Jan 30, 2020 12:21 PM

Reply
Question marked as Top-ranking reply

Posted on Jan 30, 2020 1:35 PM

Go step by step and test.


Use safe mode to try to isolate the cause of the issue.

Once in Safe Mode, click the “Restart” button at the bottom of the screen to exit Safe Mode.

Test.


Reset PRAM:  Reset NVRAM or PRAM on your Mac - Apple Support


Reset  SMC:   How to reset the SMC of your Mac - Apple Support   Choose the appropriate method.

4 replies
Question marked as Top-ranking reply

Jan 30, 2020 1:35 PM in response to pkgoon

Go step by step and test.


Use safe mode to try to isolate the cause of the issue.

Once in Safe Mode, click the “Restart” button at the bottom of the screen to exit Safe Mode.

Test.


Reset PRAM:  Reset NVRAM or PRAM on your Mac - Apple Support


Reset  SMC:   How to reset the SMC of your Mac - Apple Support   Choose the appropriate method.

horizontal line on mac screen

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