Persistent horizontal lines appear on iMac screen

have the same issue appear today. Suddenly a lot of black horizontal in the bottom of my iMac M1 2021 blue 24 inch. I don't know what happens cause working on this Mac, opening some file and go to screen saver when back, this is already there.

Hello Community,

Sorry for my bad English.

Since 2 Days I have these lines on the display too.

I chatted with Support and his answer was curious : I have to clean my screen. it is dust or something... REALLY ???

I have abt. 10 lines in black and regular 10 lines in white wich disappear every one second, then they come again.

iMAC 2021, M1, 16GB, 2TB SSD

Yours,

Wolle

Mine started showing these multicolour lines in less than a year after purchasing it in July 2022. Sales people didn’t advise of any manufacturer service cover or anything like that. When I went to iStore they wanted to charge me over R36k to repair it - which was ridiculous to say the least. There is no way all users could be having the same issue and Apple doesn’t want to take accountability for this defects, after we spent so much money to purchase these devices. I need a personal laptop desperately, I don’t have money they need to fix it and I can’t just give it away because when I tried to trade it, they offered a fraction of what I spent to buy it - which is unacceptable. Can anyone advise what the best way is to resolve this, please?

Absolutely ! In the years I owned 2 iMacs plus 2 mini and 2 MacBooks but now I say I'll never purchase an iMac again ! Yes It may happen such kind of fault (even if I never happened to me in the past) but the worst thing in my opinion is feeling abandoned. When my iMac 24" M1 showed the fault I had to purchase a new mini (November 2024) and a new monitor (I had some work in progress) for a problem I didn't cause.

Mine has started doing it today as well! Also 24" iMac purchased July 2021, so have had it around 4 years. My previous 2 iMacs lasted around 7 years each and were still working, only replaced them due to needing something speedier.

[Edited by Moderator]

My company is a huge Apple user, and their lack of a resolution to cover the replacement or repair of the M1 iMac screens which are clearly a defect is making us consider another vendor for our hardware going forward.

What makes you think I'm on Apple's side?

I just posted the facts about Apple Engineers not being in these forums and when to "complain"/report your problem. Remember the squeaky wheel gets the grease.

You got into a situation but don't shoot the messenger.

iMac Feedback was no help to me. I was even told that someone would get back to me with a solution! That never happened. I love Apple products. I have been using all of them for years. This issue with a computer that was barely one year old is extremely disappointing. Apple MUST come up with a solution, as it seems to affect thousands of users. Come on, Apple. I mean, come on.

Hi everyone. I've decided i'm not buying a new Apple product until Apple make on this problem what it's correct, because they know that this is an hardware design problem and nothing else.

So Apple must organize a service for everyone affected.

Waiting.

My iMac, purchased at the beginning of 2022, started this issue out of nowhere today. Ran through all the possible checks provided online before I came across this thread. Posting to make sure Apple knows that there are so many of us out here who have been sold the same defective product with little to no solution.

[Edited by Moderator]

Hi Apple Community,

As a loyal Apple user for 15+ years from Colombia, my family and team have always chosen Apple for our computers, iPads, iPhones, and Apple Watches. We deeply appreciate Apple's exceptional quality and customer service.

The Issue: I'm experiencing persistent horizontal lines on my iMac 24" screen - a problem affecting thousands of users worldwide. The external display works perfectly, confirming it's an internal display issue.

Our Request: Given the widespread nature of this problem, we respectfully ask Apple to:

• Investigate this as a potential manufacturing defect
• Implement a quality policy for affected iMac 24" users
• Offer complimentary repairs for documented cases

We've seen successful free repairs in this community, which gives us hope for a similar resolution.

We remain big Apple fans and trust in Apple's commitment to quality and customer satisfaction. This would be a great opportunity to demonstrate why Apple continues to lead in innovation and service.

Thank you for considering our request.

Best regards, A loyal Apple user from Colombia 🇨🇴

I have a group of people (72) on Chinese social media who has this issue, still adding ... this is not a case to be ignore, please united to solve this problem together apple users!

It costs almost 5000yuan in China to replace the screen, even I choose to replace this, then I will be afraid this screen will have the same issue. Right?

How should we do this ? any heads up? an idea to reach the top and rise their awareness? and give us a good solution.

"It costs almost 5000yuan in China to replace the screen, even I choose

to replace this, then I will be afraid this screen will have the same

issue. Right? "

While I can't promise, it seems that newer screens don't have the issue. We haven't heard about it on newer iMacs.

Same thing is happening to my Mac. And it gets really hot on a very small portion of left part of the screen. Bought Feb 2022. Just updated to the latest OS. Problem persists. Already sent apple feedback. So many people experiencing the same problem. Really hope apple does something to fix it.

Apple auto-emailed me, inc:

Congrats docmartinhk! At the time of this email, your reply was upvoted for the first time:

[quoted my comment]

And the thread was viewed 91829 times. This means that you helped both the person who voted on your reply as well as everyone who viewed the thread.

• actually, only "helped" by letting others know another has this problem, and showing Apple Store this thread and posts likely won't help with getting display replaced without full payment. Which is not really helpful.
• 
  
• And having so many views, seems to indicate a real issue; it's not the only thread on this either.