Persistent horizontal lines appear on iMac screen

"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".

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.

This is just the beginning. My iMac M1 started with some lines below, slowly filled up over the span of few months and eventually a black screen. If the problem is the quality of the product, a replacement will give you the problem again. Why are we bearing the cost of a product that is below par?

I have this problem also, the lines flicker with mine. It occured while I kept my computer stationary without moving it at all. It's clearly a defect with the display because it happens without a cause. Apple should offer a free fix to people who have these lines regardless of warranty status. I can't pay the 700$ currently and it's ruining my computing experience.

This must be a software issue, all these reports seem to have suddenly happened in a short period of time with machines the same age.. this is my wife’s iMac and it started while she was using it.. just suddenly popped up like it. Turned it off for 24 hours but still the same.

This is clearly a hardware failure and the only solution is to replace the screen. No one on this forum can fix it for you. I doubt it is something most users have the tools and training to do themselves. It is an expensive repair, but I do not see any other options.

About 40 others seem to have posted with a similar failure. I do not know how common it is; there are many millions of iMacs M1 in use. Where I work, we have thousands of this Mac model in daily use and I have not heard of any failures like this. I do not doubt that your failure is real, but it might not be very common. All electronics have some non-zero failure rate, I believe these parts are mass produced overseas, a small fraction of all electronics like this have defects. I think the way to protect against this type of repair bill is to get Apple Care, but that is hundreds of dollars spread over several years, I buy it anyway for my personal Macs (which include one iMac M1). If I look at all the iPhones and personal Macs I have owned and how often I used AppleCare for a "free" repair, I have paid way more for Apple Care than I would have for the repairs myself. But I still get Apple Care for peace of mind as laptops and iMacs and iPhones continue to increase in cost ...

Exact same issue popped up on my 2021 M1 24" iMac this week. Purchased it back in April 2022, so a little under 2 years. I have it connected to a secondary monitor, which works fine. Only the main iMac display's showing this issue. Have also tried resetting the iMac which didn't work.

Have an appointment scheduled at the Genius Bar in Singapore tomorrow, which I plan to cancel. There's no point bringing my device there only to be told to pay upwards of $800 to get a screen replacement done when I can get a Mac mini for the same price. Everyone in my family is on the apple ecosystem, including MacBooks and Mac minis because because we trust in the quality of Apple products so this happening is just shocking.

Having the same issue here. 24inch M1 purchased on August 2021. Everything works fine until MacOS update. Started from bottom of screens which covers the app dock and two days back it went up with the bottom bar suddenly became alright.

I don't think the problem is the software update. I purchased mine in june 2021. This same problem occured 2 days ago (9 Feb 2024) In these 2 years and 8 months I never updated the software because I just don't do it when everything is working fine.

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...