Hello all, I’m starting to get the same issue with dust inside my iMac 27” (Late 2013) screen. I found this video on YouTube which shows you how to separate the LCD from the glass to remove the dust. https://www.youtube.com/watch?v=WE6Vm1yxkVM Unfortunately it doesn’t go into the finer details of what goes where but might be a good place to start if you want to try and clean it yourselves. Maybe someone can make a newer tutorial based on this one?