Want to highlight a helpful answer? Upvote!

Did someone help you, or did an answer or User Tip resolve your issue? Upvote by selecting the upvote arrow. Your feedback helps others! Learn more about when to upvote >

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

iMac 27 inch 2020 - Screen Glitch (Random Lines Appear on Screen)

I've just received my new iMac and noticed that from time to time a line glitch appears on my screen.

It's completely random, I thought it was related to intensive work/heat but sometimes even when the computer is idle I see the line on the screen.


It was really hard to capture it because it's so random, but I manage to record the moment a glitch happens. Unfortunately there's a lot of white background on it which makes it hard to see, but it goes across the entire screen https://www.youtube.com/watch?v=xw8Z4mVgYgE


The iMac is running fine, I ran all sorts of benchmarks for CPU/GPU and it's all OK, but from time to time I see this annoying line on my screen.


iMac Line (2012 and Later)

Posted on Aug 26, 2020 7:21 AM

Reply
Question marked as Best reply

Posted on Nov 8, 2020 2:27 PM

Try the following: download and apply the macOS Catalina 10.15.7 Combo Update   


It fixes this issue:


• Addresses a graphic issue that may occur on iMac (Retina 5K, 27-inch, 2020) with Radeon Pro 5700 XT


249 replies

iMac 27 inch 2020 - Screen Glitch (Random Lines Appear on Screen)

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple ID.