I have a 27" iMac, late 2013 model. There are now5 little tiny insects (yes they are insects not pixels, I can see their wings) behind the glass. I have googled about this and see that others have had this problem. I called Apple today and 2 Apple Advisors told me they had never heard of this problem, and it was not a known problem, and they would be happy to let their upline know about it. , and no offer to take responsibility and just fix it. When I googled there were reports on this from years ago. How can Apple not know about this? Is anyone else having this issue, and has anyone had satisfaction from Apple on this issue?