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Message: <blockquote data-quote="techiesteve" data-source="post: 1914397" data-attributes="member: 98520">I'm not sure how the dust gets into the display, likely through the display rear metal shielding, but it certainly does. It's usually very fine, mainly causing dark patches in the display corners. It's quite common. I see it more in iMac's that are extremely dusty inside. The only solution I have is to replace the display when economically viable. If you can see individual dust specks it's not what I'm used to seeing. I have also seen some large chunks of debris in the display, along with clusters of dead pixels, not so common.Dust ingress in the iMac displays from 2009-2011 would look like a cloudy sky when powered up on a white or light coloured image. The dust would be within the display, not behind the glass.</blockquote>