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2.3GHz, 2.6GHz, or 2.7GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.7GHz) with 6MB shared L3 cache.

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Why is my screen flickering like a kaleidoscope?

The screen shortly after logging in flickers, redrawing the graphics incorrectly, almost like a memory issue. The issue occurs on a second monitor also. I considered it could be software, but then experienced the same issue when about to do a time machine restore, by pressing command and R on reboot. Previously the laptop has had the vcore recall, I haven’t checked, but was advised my whole logic board was replaced vs just the rubber square stuck-on the vcore chip to apply pressure and improve contacts. In any case the flickering presented now is different to the issues then.

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1 Answer

Well your logic board has a new problem! In this case you have either a cold solder joint on the GPU or the VRAM chips or have a bad chip.

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