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Purple boxes on screen

I'm using a MacBook Pro mid-2015 with AMD Radeon R9 M370X 2048 MB GPU.

I recently noticed strange purple squares in the bottom right corner of the screen.  Anyone have any ideas what is causing this and if there's a solution?

Thanks in advance.

Here is a screenshot:

Have you tried an NVRAM reset?

How to reset NVRAM on your Mac - Apple Support

Yes. This did not help.

It may be the Graphics card run Apple Diagnostics to check your hardware. Diagnostics isn't the most sensitive test but if it reports an error there usually is one. Apple Stores have more comprehensive tests they can run.

How to use Apple Diagnostics on your Mac - Apple Support

最後更新：2017-10-17 05:34:59

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