Horizontal Lines on Screen of iMac, 24", 2021

Hi,

This is a common issue on new iMac. I hope Apple would recall program about it.

+ 1 I keep watching for it in the extended Apple Service Programs.

Apple Service Programs - Apple Support

Hi everyone,

I'm experiencing persistent screen flickering on my M1 iMac (purchased in September 2022), and I'm not sure how to proceed. The flickering intensity seems directly tied to screen brightness—higher brightness levels render the flickering lines for a longer duration, while at lower brightness, they appear less frequently.

Several reputable news sources have covered this issue, highlighting that it affects multiple M1 iMac users globally. Given that I am in Gwalior, Madhya Pradesh, India, where extreme summer heatwaves are common, I’m concerned about the long-term reliability of my device.

My Current Situation

• I use this iMac as my primary work computer for freelance work.
• I recently moved back home from city life and cannot afford immediate repairs or a replacement.
• I’ve already spent a lot on my convocation travel (Feb 24 – Mar 1, 2025) and late college fees, impacting my savings.
• I also pay a monthly EMI for my education loan, so additional expenses are difficult.
• External monitor? I can’t afford one right now.
• Apple Authorized Service Centers? I don't trust third-party centers in my area based on past experiences.
• Taking the iMac to Delhi? Not an option due to travel and accommodation costs.
• My iPad no longer works, so I’ve stopped digital drawing altogether.

Timeline of the Issue

• The first minor flicker appeared a week before my convocation trip (mid-February 2025), but it disappeared on its own.
• After I returned home on March 1, 2025, the flickering became persistent and hasn't gone away since.
• The iMac has never been moved since I unboxed it in September 2022.

Concerns & Next Steps

I bought this iMac considering Apple’s reputation for longevity, but right now, it feels like a gamble. I’m stuck deciding whether to repair it (which might be costly) or invest further into a product with known issues.

Has anyone here faced a similar issue?

What are my possible solutions without breaking the bank?

Would appreciate any guidance.

Thanks!

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.

Let's boycott these low quality products and spread the word. My computer can no longer be used due to this Apple defect. Screen completely black at the bottom and above the defect lines.

Same problem. Same screen lines. Same response from Apple Store. Not a manufacturing issue. You just need a screen replacement. That’ll be £630 please.

This definitely needs to be an extended Apple services program. Asap.

It needs to be replaced. At this time Apple has not announced a recall or offered to fix them for free.

If you want to bring this up to Apples attention send feedback:

Product Feedback - Apple

Just wanted to add another example. My 2021 M1 iMac screen is failing with gray horizontal lines. Genius Bar rep said he'd never heard of the issue. $640 repair. Zero trade-in value.

gosh, me too. purchased summer of 2021, started glitching this past week. everything else is working fine and i've updated everything i possibly can. this feels like a very common problem and i'm frustrated that they're forcing users to spend more money to fix an issue most likely from the hardware itself. :(

You are not speaking to Apple on these forums, they are the hosts however they DO NOT read or participate in user to user forums.

If you want your voice to be heard please post at www.apple.com/feedback. They will not answer you directly however your post will be read.

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.

For additional context, I have the following iMac:

iMac (24-inch, M1, 2021)

• Ports: Two Thunderbolt / USB 4 ports, Two USB 3 ports
• Chip: 8-core CPU (4 p-cores, 4 e-cores), 8-core GPU
• Storage: 1TB SSD storage
• Memory: 16GB unified memory

Ordered on: May 12, 2021

In terms of my exact symptoms, I don't think it's dead pixels. When I run a dead pixel test, I see two distinct issues:

• Along the bottom rows of pixels, there are three or four alternating black horizontal lines extending across the entire screen, just below the dock
• In the lower right section of the screen, from the base of the dock up to about 20% to 25% of the display, thicker light grey lines are visible, primarily on the right side. These lines add a textured appearance to the folders in the dock and are especially noticeable on an all-white background

Identical problem here. 24" M1 iMac is 3 years & 2 months old (so, just outside warranty period).

Going to call Apple today.

Hi,

Same here, got mine in October 2021 and the problem started a few months ago.

It's very annoying and gives you seizures/headaches because of the "strobe"effect.

Tried everything (reinstalling macOS, updating, leaving of off for days) and nothing worked.

Hope Apple recognize the problem and extend to its repair program.

Just got the same issue today. The horizontal lines are flickering near the bottom of the screen. It is not much of a bother for now, but I'm worried that the issue will become worse soon.

I bought my iMac in 2022, thus the issue popped up after 3 years of frequent daily use. It is a bit longer than others. I'm not using Auto Brightness, and the Brightness level is relatively low all the time.

Just posted as we are on the same boat 🤞, and looking for a feasible solution from Apple.