Strange lines on screen only in Time Machine

I have some strange vertical and horizontal lines when I enter in Time Machine.

I've checked for errors on the the graphic card but it's working fine.


Specs:

macOS Sierra 10.12 (16A320)

iMac (Retina 5K, 27-inch, Late 2015)


User uploaded file




User uploaded file

iMac with Retina 5K display, macOS Sierra (10.12)

Posted on Oct 19, 2016 11:13 AM

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Strange lines on screen only in Time Machine

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