Late 2012 27-inch Flickering Screen

[Hexley]

The flickering is as if you blinked and the brightness briefly dips then increases back to normal again.

I hope this isn't a break down on the Mac as I do not have AppleCare on it.

Electrical power (house lights) aren't flickering. I changed the powerstrip and the flickering reduced a bit.

 

[Hexley]

Anyone?

 

[iMi]

Try resetting VRAM to address the problem. Power down. Hold option+command+r+p. While holding down the buttons, power the machine back on. Chime will indicate the reset.

Good luck. Post to let us know this helped.