- Jun 21, 2017
5k, 27 inch, 3.6 8 core, 64 gb ram, Pro Vega 48 card. My iMac is used as my second monitor, heavy photoshop work. Randomly half of the screen will go black or white and not solved until I reboot at least once. I've reset pram and smc, still does it at different times. Using activity monitor to check ram availability and there's plenty left. Any thoughts? card going bad?