Horizontal Lines on Screen of iMac, 24", 2021

The same thing happened with my iMac M1 today and also after the device ran out of warranty. The support specialist told me on phone, that i need to pay the repair. When i told him, that there are many other users who have the same problem, he said, this is the first time he's dealing with this issue.

What i've noticed is, that the upper right corner of the display gets incredibly hot. But then after manually cooling it down. The temperature is and stays "low". This is fishy for me.

If the iMac has a production bug which is revealing after some time, in my opinion Apple IS accountable for this bug, even if it appeared after the warranty ended, since how can a customer complain about a hidden bug during warranty when he doesn't even know that the bug exists.

I have an appointment at the genius bar and i hope Apple has the face to offer a fair solution !!!

This has been reported for over 6 months in this thread alone. If Apple has not yet doing extra-warranty repairs, I doubt that they ever will.

Currently there is no Service Program for that issue but keep checking this website in case Apple instigates one: Apple Service Programs - Apple Support.  

You'll have to keep tabs on this Apple site, Apple Service Programs - Apple Support. to see if a when a recall service/repair program is announced by Apple.

In the meantime you might consider getting an inexpensive 3rd party monitor to use with your iMac.

Display vertex surface heating to scorching 55°C (22° more than device normal), another symptom for this issue. Apple technical support is not helpful in explaining why this happens after 28 months of normal use.

I have documented the overheating anomaly in M1 iMac (horizontal lines-issue) here:

M1 iMac Display vertex heating to scorchi… - Apple Community

Why would I get a display replacement without an explanation? This is not good. Considering this I am thinking of selling the other iMac I have at home, as there is no explanation provided.

L2E2 wrote:

I have a 2021 M1 iMac and am experiencing the exact same issue. Is Apple addressing this?

Not at this time. Keep tabs on this Apple site, Apple Service Programs - Apple Support, to see if and when a repair program is initiated.

same issue here, iMac 24 inch 2021..

You'll have to check the website I posted in my last reply to see if and when Apple will have a service/repair for the M1 iMac screen.

If you have to bite the bullet and get a new Mac I strongly recommend getting a Mac Mini M4 with a 3rd party 4k monitor. A Mac Mini M4 with 15 GB RAM and 1 TB SSD with a 32" LG 4k monitor w/speakers is $1418 w/tax which is $650 less than a similarly configured new 24" iMac.

Just some food for thought.

same issue here, iMac 24 inch 2021

Same issue with my iMac M1, after two years of usage. Horizontal lines mostly from top to bottom, and flickering screen. Sometimes the upper rim corner gets too hot to touch. I sent feedback already. I'll take my Mac to service as soon as I can.

The problem has made me decide against a new Mac.

I have a 2021 M1 iMac and am experiencing the exact same issue. Is Apple addressing this?

Submit feedback to Apple at www.apple.com/feedback and then make an appointment at your local Apple Authorized Service Provider have it serviced and repaired. Apple has not announced any repair programs for what you are experiencing, if/when they do your out-of-pocket expense will be reimbursed.

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.