955      iPhone_iPad_Mac_apple

strange colored squares in the screen

Hi everyone, it has been a couple of weeks now since I have these strange colored squares that appear and flash on my iMac. I did a full NVRAM and SMC reset but the problem comes back. See the example in the attached image.

It seems that the problem comes more often when I open an app for the first time, especially Safari.

Anyone has ever seen something similar? I really don't know what to do...

Thanks!

Mathieu.

最後更新：2017-10-04 08:31:16

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