Horizontal Lines on Screen of iMac, 24", 2021

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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?

Just ran into this issue on my M1 iMac, purchased in July 2021 in Malaysia. Took it to Apple and was quoted a very expensive repair cost. No compromise, no goodwill offer. Apple wasn’t willing to help at all. Really disappointing.

Keep checking this Apple website for a Service program for the M1 iMac screen: Apple Service Programs - Apple Support

The screen broke permanently due to the horizontal lines defect. The problem lies in a cable that also powers the LCD, which is located on one of the tops of the screen. this cable (of the FFC/FPC type or Flat Flexible Cable / Flexible Printed Circuit), has to sustain a very high voltage (around 50V) to power the LCD (despite the iMac's power supply being 15.9V), and it heats up a lot! it starts to burn out and degrade at the connector, to the point where it lets the signals leak between the various connectors and short-circuits some of them, which ends up causing those lines and in the end it breaks.

That’s planned obsolescence for you. My 2006 MacBook Pro (I know it’s not an iMac) works fine including the screen (I think it has a CCFL backlight) but this happens with about everything these days sadly. I’ve got a microwave that’s under a 1 year warranty that’s losing power and before that one we had a sharp microwave from the early 90s

Not at all planned obsolescence, as has been mentioned it has happened to a small subset of users, your luck just ran out. We understand your frustration, who wouldn't be frustrated after only 4 years of use but it's not what you claim.

I purchased four M1 iMac 24" in late 2021 for my office, two with lowest specifications, the other two with highest specifications. Unfortunately both of the higher spec iMacs have exactly the same issue started from March and June this year. This is a 50% fail rate after three years of careful use.

It is disappointing as the issue was firstly reported as early as 2023, then hundreds of users expressing "me too" in Apple's forum, Apple seems do not care. I am sure there are many more customers who experienced the same issue but did not hit the "me too" button.

I talked to online support about my findings, also took the iMacs to Genius Bar despite hours of traveling. While I was 99.9% sure it is a hardware issue, I still followed their advices and wasted hours of playing with the software/hardware issue isolating game, by erasing all content and reinstall Mac OS. The specialists sound empathic, but the options provided are still 1) pay to repair or 2) not to repair. I don't blame them, as they are just following the company's guidelines.

I have sent a feedback to Feedback - iMac - Apple to request for a Service Program. Hopefully Apple takes this issue seriously soon enough so they don't turn loyal promoters into detractors.

If your 2021 iMac 24" is having the same issue, please also send a feedback to Apple, and post your case here. It seems the older thread is closed where I cannot post new comments.

iMac 1:

iMac 2:

[Edited by Moderator]

iMac screen failure..

Horizontal lines at the bottom of iMac(M1… - Apple Community

Also...

Persistent horizontal lines appear on iMa… - Apple Community

I am facing the same issue as everyone else here. The lines appeared on my device a few days ago. This is the first time an Apple device has failed me within three years of use. It’s too expensive to get it fixed.