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late 2019 iMac, half the screen goes black or white randomly

T

threemonkeyzoo

macrumors newbie
Original poster
Jun 21, 2017
21
2
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?

Thanks👍
 
Could be. Have you run Apple Diagnostics (hold D on boot)?

Did you put 3rd party RAM in? If so, do you still have the issue if you remove 3rd party RAM and put Apple RAM back in?

Is your Mac still under warranty?
 
Thanks, yes I did run diagnostics, no issues. I didn’t take out the ram, need it for big photoshop files, standard ram would be too small. It is under AppleCare.
 
If you have a good backup you could try doing a clean install of OS X and see if you still have issues with minimal apps installed.

It would probably be worth getting it checked out in an Apple store. If you're using 3rd party RAM Apple would likely want to know if you still have the problem with the stock Apple RAM to rule out a RAM issue.

RAM passing a memory test means that it might not be related to a problem, it doesn't rule it out from being a possible cause.
 
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Sounds like a problem between the GPU and the screen itself. Might be a cable, might be the screen itself, might be the output part of the graphics card.
As you have applecare: time to make a backup or two, add an apple admin account so you don't have to give your password and get ready to turn it in for repairs.
 
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s66 said:
Sounds like a problem between the GPU and the screen itself. Might be a cable, might be the screen itself, might be the output part of the graphics card.
As you have applecare: time to make a backup or two, add an apple admin account so you don't have to give your password and get ready to turn it in for repairs.
Click to expand...
Good idea, thanks
 
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