I have dust AND an insect between the glass and LCD panel on a 27" Late-2013 iMac which was gifted to me.
I have already upgraded the CPU in it to an Intel i7-4771, but held off re-gluing the display panel back on prior to evaluating the stability of the system with a much higher powered CPU than it originally shipped to me with.
The cooling solution is actually inadequate for the beefier CPU when it runs for a significant time, despite maxing out the fans, it still throttles way down.
I will probably have another go to get rid of this beastie:
and the dust:
Both are absolutely beneath the glass and above the LCD.
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