Horizontal Lines on Screen of iMac, 24", 2021

A continuation of closed topic: Persistent horizontal lines appear on iMa… - Apple Community

This morning, horizontal lines appeared across the lower 2/3 of the screen on my iMac computer, purchased in August of 2021. It happened the morning after an auto-update to Sonoma 14.6.1, but after reading the "Persistent horizontal lines appear on iMac screen" feed in the Community forum, I saw that it was a common hardware issue with the new silicon iMac computers.

The lines downgrade the font quality, and they flicker making using the computer hard on the eyes. This definitely interferes with my work. I have already posted feedback to Apple on https://apple.com/feedback/imac

My iMac is no longer under warrantee, but with this being a common occurrence with the silicon iMacs, I am hoping that Apple will stand by its products and its good name by either repairing or replacing the computer at no cost to the consumer.

[Edited by Moderator]

iMac 24″, macOS 14.6

Posted on Sep 2, 2024 10:33 AM

Top-ranking reply

Old Toad

Level 10

215,088 points

Posted on Mar 24, 2025 3:44 PM

What you're experiencing is a display problem with early M1 iMacs.

The following topics illustrate the Silicon M1 iMac Display problem:

Screen Failure on 24-inch-iMac, M1, 2021 - Apple Community

Persistent horizontal lines appear on iMac Screen - Apple Community

Horizontal Lines on Screen of iMac, 24", 2021

Horizontal black lines covering bottom 3rd of 2021 M1 iMac screen

Grey horizontal patches on my M1 iMac 2021 model

Horizontal lines at the bottom of iMac(M1,2021) screen

Horizontal Lines on 2001 M1 iMac Display

Persistent horizontal lines and other issues on iMac M1 display

As you've already been urged to do is take it into the nearest Apple Genius Bar for a free diagnostic test. You'll be told that the repair will cost about $600 US and that there is no replacement program currently for the problem. If you take it in you're telling Apple that there are more M1 iMacs with the problem and you'll be in their database if and when there is a repair program initiated.

Some users have opted to get an inexpensive 3rd party monitor and run it with the iMac. It's certainly less expensive than the repair costs.

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Horizontal Lines on Screen of iMac, 24", 2021

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