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mac briefly shows stains

HI,


I have a mac with osx el capitan.

After log in, I see this one second.

User uploaded file



I see this only when a device is connected.

if only my headphone is connected, it happens

if only my external monitor is connected, it happens

I went to an Apple premium reseller, they have performed a hardware test. but found nothing.

I have the pram and smc reset,osx el capitan reinstalled

but nothing helps.


This problem came a week after I had installed el capitan.


anyone know a solution?


Thank you in advance!

iMac (21.5-inch, Late 2013), OS X El Capitan (10.11.1)

Posted on Nov 29, 2015 12:05 AM

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mac briefly shows stains

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