"Customer Brought In This iMac For Not Powering On. This Is How He Apparently Uses It"
"For further context: I'm 99% sure the customer has been running his iMac with the shipping plastic in place since 2015, including on the bottom covering the vents, as there's airflow patterns of dust and certain areas where the plastic has melted/deformed; note the scotch tape ON the plastic covering the camera.
EDIT: Just called the customer and asked/confirmed the plastic has been in place; "I guess that's why I hear the fans ramp up!" And he wants to keep the plastic in place, lol. But I got him to agree to at least let me clip the bottom portion so it no longer wraps around the vents."
..its not how it works.