Chosen Solution

I’ve attached a photo below for viewing, But I’d like to know: What is this?How did it come about?How do I fix itWhat’s the cost? Thank you kindly =)

LINK TO IMAGE: https://ibb.co/dvSu1b Look at the left screen border and notice the lighter pixel band.

Clearly the LCD screen is having problems. I haven’t see this on a Cinema display but I have see this in the older iMac’s. The LCD screens lamination is coming apart. You’ll need a new 27" LED Cinema Display LCD panel - Apple P/N 661-5542