Persistent horizontal lines appear on iMac screen

I am reaching out to share an ongoing issue I, along with several other users, have been experiencing with our iMac 24-inch models, and to seek a collective resolution.


Problem Description:

  • Persistent horizontal lines appear on the screen, which significantly hampers the usability and visual appeal of the device.
  • This problem arises without any physical damage, and despite the stationary nature of the device.


Steps Taken:

  • Connected to an external display: The external display works fine, indicating the issue is with the iMac's internal display.
  • Reinstalled the OS: The problem persisted post reinstallation.
  • Avoided operating the iMac for a week: No change in the situation.


Concerns:

  • The cost of screen replacement is high, and there's no assurance that it will resolve the issue permanently.
  • The quality concern is alarming especially for a brand that positions itself as a premium segment player.
  • The support received thus far has been unsatisfactory, with no definitive solutions provided apart from a costly screen replacement suggestion.





Please do not ask us to visit to service center and replace the screen for 650USD + , problem happens mostly after warranty.


[Edited by Moderator]

iMac (M1, 2021)

Posted on Oct 21, 2023 10:40 AM

Reply
Question marked as Top-ranking reply

Posted on Jul 19, 2026 11:29 PM

Hey everyone, I wanted to share my experience in case it helps other M1 iMac owners facing the same display issue.


Before I contacted Apple, I came across another user’s post describing their own experience with a display failure and a successful goodwill repair. Reading that gave me the confidence to seek a goodwill review for my own case instead of simply accepting another expensive repair bill.


Now that my case has been resolved, I wanted to return the favour by sharing my own journey in the hope that it may help someone else in a similar situation.


My timeline:


  • Purchased my M1 iMac in Jan 2022.
  • In 2024, the display developed horizontal lines. I paid out of pocket (~SGD$800) to have the display repaired through Apple.
  • In Apr 2026, the exact same issue happened again. Horizontal lines reappeared on the display, while the Mac itself continued to work normally. I connected it to an external monitor, and the external display worked perfectly, suggesting the issue was isolated to the iMac’s built-in display.


Since this was the second time the same component had failed, I contacted Apple Support and explained that this was a repeat failure after a previous Apple repair.


The process I went through was:


  1. Contacted Apple Support and have them escalate my case to a Senior Advisor.
  2. I was asked to visit the Genius Bar for diagnostics.
  3. After the Genius Bar confirmed the display hardware issue, I was asked to proceed with the repair first. I was told that the goodwill review could only be processed after the repair had been completed.
  4. The repair was completed (the repair cost was around SGD$900), and I informed the Senior Advisor as instructed.


Unfortunately, communication stalled after that. My repaired iMac remained at the store for weeks while I waited for an update from the Senior Advisor.


I eventually contacted Apple Support again, and a new Senior Advisor took over my case.


The new advisor submitted a goodwill repair request to management. It was rejected twice. I asked whether my case had clearly highlighted that this was a recurring issue after a previous Apple repair. The advisor explained that the previous case notes already documented this, but he submitted another review specifically emphasizing that this was a repeat failure.


That final review was approved, and Apple granted a full goodwill waiver for the repair.


From the time I first contacted Apple until the goodwill approval, the entire process took about slightly more than a month, so if you’re going through something similar, be prepared that it may take some time.


A few things I learned from this experience:


  • Be polite and patient throughout the process. Every advisor I spoke with genuinely wanted to help.
  • Clearly explain that this is a repeat failure of the same component after a previous Apple repair if that applies to your case.
  • Follow all requested diagnostic steps and keep your case history consistent.
  • If your case goes quiet for an extended period, don’t be afraid to contact Apple Support again. In my case, having another Senior Advisor review the case ultimately made the difference.
  • If a goodwill request is initially declined, it may still be worth asking for another review if there are important details that deserve additional emphasis.


I’m not suggesting this outcome will apply to everyone, as every case is reviewed individually. However, if you’re experiencing a repeat failure after a previous Apple repair, it may be worth politely asking Apple to review your case for a goodwill repair.


I hope this helps someone else who finds themselves in the same situation, just as someone else’s post helped me.

Similar questions

521 replies

Oct 21, 2023 12:27 PM in response to Old Toad

Lol free diagnostic? They charged ne 30USD for inspection and told me that 650USD is required to replace the screen. I did the diagnostics there are no problems, display just fails for iMac 24 inch.


It's a problem faced by many, Apple product failed multiple times in a span of 2 years, I could now have brought another iMac with repair cost. This product had a logic board failure during warranty period and apple denied replacement, now this. Any way I have to buy new one now for my work ( Let the stock raise lol )


Similar issues are being faced by many, so why denying it?

Oct 21, 2023 12:50 PM in response to latVm

"They charged ne 30USD for inspection"


Who exactly is "they"? In the US, the Apple in-store diagnostic is certainly free; I've taken advantage of that twice in the last six months.


If there is a "consumer product protection" agency in your country. I suggest you file a complain. Please post the final results of that here if you choose to do so ... if you can file such a complaint of course.


Considering the millions of Apple Macs worldwide, the number of complains here is an exceedingly small percentage of the whole. Problems happen for sure, but just because it happens to you does not mean it happens to many. That's known as a "hasty generalization".

Oct 21, 2023 1:39 PM in response to stumpy1946

Thanks!. We don't have Apple support here, It's mostly Apple authorized service centers outside US. They decide the service pricing.


Yes, it's not like I can't afford another one or repair, but it annoys me to see that way things are, it worse than cheap companies here. Yes court action is in progress.


Exactly, but it's not worth make that "small percentage" suffer? Accept that there there is some fault in the product, take actions to avoid it, provide some option for customers fix, instead of saying "You brought it, we don't care". There is nothing like "Replacement" once a product is brought, which is unfair sale practice, and yes, Apple policies are not above the law.


With this post ( which I know Apple don't care ), but hope it helps someone to take some action.

Oct 22, 2023 4:47 AM in response to hcsitas

I've been to the Apple Store in Shanghai and the repair fee without Apple Care is about RMB 4,891 which is even more than the recycle fee lol. They said that the solution could only be screen replacement and they have no idea why the problem came out. Cuz there are so many user suffering the same problem I wonder if Apple should be responsible for this problem.

Dec 14, 2023 7:23 PM in response to Akipotpot

Update: The horizontal black line disappeared, turned it off for a few days after but when I turned it on it was still there, a few hours after, I thought it disappeared by itself, but it just moved to the left part of my screen and became a vertical yellow line. Starting from where the horizontal line appeared the last time down to the bottom. Up to now, the vertical line is still there. It's unnoticeable, better than the irritating horizontal black line.

Persistent horizontal lines appear on iMac screen

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