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Transparent vertical shadow box on left of screen

I recently purchased a mac book pro 2019 that was refurbished. On the left of the screen there seems to be a transparent vertical shadow box that only appears on white screens. It flashes and gradually turns pink when there is no movement from my mouse. The only way it goes away is if I move my mouse constantly. If I am watching a Youtube video or on my home screen this shadow does not appear. Please help :( I literally just purchased and not sure if I have to take it into apple.

Mac Pro

Posted on Sep 28, 2020 3:20 AM

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Question marked as Top-ranking reply

Posted on Sep 28, 2020 3:38 AM

Look like an issue related to hardware, you may need to get it repaired / serviced from Apple.


You can also check if you can reproduce the issue in safe mode.

How to use safe mode on your Mac - Apple Support


See if resetting nvram / pram helps.

Reset NVRAM or PRAM on your Mac - Apple Support

7 replies

Transparent vertical shadow box on left of screen

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