Persistent horizontal lines appear on iMac screen

Not a software issue. My workaround is using an external monitor, which works fine. Also I can share the screen to my smart TV, which also looks fine.

No, this is a hardware issue with the iMac itself.

What region is your iMac Part number in? I suspect this is happening to iMacs in a particular region.

List of Model Number suffixes for different regions:

• LL/A - the US and Canada
• HN/A - Indian Subcontinent
• E/A - Mexico
• B/A - United Kingdom
• D/A - Germany
• F/A - France
• J/A - Japan
• CH - China
• ZP/A - Southeast Asia
• X/A - Australia and New Zealand.

I visited an Apple Store and they said it will cost £630 to replace the display with a 3 months warranty on the new display. I declined as this is half the cost of the iMac itself and the issue could return again. Even the “genius” at the store said they would not recommend replacing it.

This is completely unacceptable for “premium” hardware to fail after 2.5 years and Apple not able to repair it for free.

I will never buy an Apple product over £700 again.

The only last hope is the person at the store said if enough people have this problem then Apple could start a repair program. But I highly doubt this will happen.

I bought mine in June 2021 and since it was a new product on the market I decided to pay 150€ to extend the warranty (store's insurance program) to 5 years. This issue happened this month and the store replaced the display with no additional charges.

They didn't specified the problem but it's not software related.

Two ports, Part number ends in PO.

I have the same problem.

iMac 24" 2021 was bought in Aug 2021. Now with just two and a half years.

Lines started to appear near the bottom of the screen and went up until fill up about 70% of the screen with ghosts of the dock app icons at the bottom.

My second monitor is working perfectly.

Very strange...

Same problem for my 2 year old iMac. The horizontal lines appeared shortly after 1 year. I brought to Apple Store and got quoted SGD$950 to repair the screen. The cost is more than half the price of the iMac itself. Hopefully Apple acknowledge this issue and offer repair programmes.

So the issue started appearing 3 days ago on the iMac M1 I bought when it first came out, almost 3 years ago.

For reference, model number is Z14M000RWFN/A.

Maybe we should look into the models we got, if this is due to an heating issue, it could have to do with the fact that the base models iMac (similar to the one I got) only have a single fan, whereas the 4 TB4/USB-3 ports models have two of those.

I'm kinda disappointed with all the iMacs I've had tbh. My first 2009 iMac had the yellow screen issue, my 2014 iMac 5K had ghosting issues, and now this one. In retrospective, maybe it was not a bad move from Apple to discontinue the high-end iMac line, given they all have some kind of widespread screen issues.

Sadly, this is not a software issue. You can easily see that if you make a backup. Wipe your drive and reinstall the OS NEW. As many have tried, it won't go away. Component has failed and will need hardware repair.

Sadly, this is the community forum. No one at Apple Support or up will respond. I don't even think they read this stuff here. Anyway, you can bring it to the Apple Store, call Apple Support since this is a hardware issue and not software. Hopefully you have AppleCare and that will cover the cost of the repair.

Horizontal Lines happened to me just today. Bought in Jan 2022. Happened after like 27 months.

Crazy part is display issue happened for me on macbook pro 2017 15 inch after 3.5 years of purchase. Got it replaced for Rs 54000 in india. And keyboard was replaced on it once under warranty.

But keyboard malfunctioned on it too and still does not works effectively. But macbook works nice with external monitor still.

Bought iMac so that if keyboard malfunctions , i can buy it. And it did, after like 16 months, keyboard key 0 stopped working. Bought new keyboard.

But now display issue and that too device that has been on the same place not like moving with macbook.

Again spending same on display. will be too much loss.

Never needed AppleCare before but it seems i should have bought it with iMac.

Just this morning, my 14 pro max dropped and broke back glass but atleast it was my fault not in imac's case.

Double loss on same day. 24/04/2024. I will not forget this day.

This one is 4 usb-c. two fan model.

Yes, it works. It’s not a software issue. It’s a malfunction of the screen so if you replace it for a good one it will work as it should. I got mine replaced with no additional charges because I decided to pay 150€ for a 5 year insurance plan when I purchased it back in 2021.

I have the same issue on my 2021 M1 24" iMac since 2023.11. My screen occasionally flickers and there's a black line fixed appearing at the top. The support told me it would cost 20,000 TWD to replace it. They suggested either using an external monitor or purchasing the latest M3 model would be more cost-effective.

I found the issues all are from after using 2 years.

Since there have been numerous reports of the same issue, shouldn't they initiate a recall to inspect the product problem? 20,000 TWD is already half the price of buying a new one.

Hello @erinaki. I called apple again after like 20 days explained this, that someone is being offered free replacement. They were not quoting price. They said reach the genius bar, drove 1 hour 30 minutes in 48 degree celsius heat to reach the mall, there the genius bar said different countries have different rules/laws. And said i have to pay for this. I thought for a while and had no alternatives.

this is the 2nd mac on which i had to change the display by paying. But it was after 3.5 years on that macbook pro 2017 which was like even if i had apple care , wouldnt have mattered but in the case of imac, it was really necessary like the keyboard failed on me and this display now. Even all my future apple products, will make sure to buy apple care. First time broke my iphone back, because of not so good protection case. And back glass can be changed at like 50 dollars outside local shop but he said i will lose waterproof which is sad

I bought my iMac 24 M3 on May 8, 2024. And everything was fine until I noticed today May 30, 2024 a flickering at the bottom of the screen that is only visible on a gray background, but after a couple of reboots the flickering stopped. As I understand it is definitely related to overheating. I also took a video, I have the Apple warranty, but it still seems to be a problem with all new iMacs.

https://youtu.be/cxE7hrMiO10 - flickering

https://youtu.be/K4tWXNXFSn8 - non flickering.