Horizontal Lines on Screen of iMac, 24", 2021

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.

I have this problem for a long time now.

the lines no appear and disappear every 1 second, and also moves higher in the screens.

support acknowledges the issue, and that it presents in many iMac, but the repair has to be paid entirely by me…

The same thing happened with my iMac M1 today and also after the device ran out of warranty. The support specialist told me on phone, that i need to pay the repair. When i told him, that there are many other users who have the same problem, he said, this is the first time he's dealing with this issue.

What i've noticed is, that the upper right corner of the display gets incredibly hot. But then after manually cooling it down. The temperature is and stays "low". This is fishy for me.

If the iMac has a production bug which is revealing after some time, in my opinion Apple IS accountable for this bug, even if it appeared after the warranty ended, since how can a customer complain about a hidden bug during warranty when he doesn't even know that the bug exists.

I have an appointment at the genius bar and i hope Apple has the face to offer a fair solution !!!

Bought my M1 iMac last 2022. Used it regularly from 2022-Mid 2024. Have used it approximately 10-20x since Aug 2024 since i have moved out. While surfing the net, sudden horizontal lines appeared. Then began to shift. It distorted some of the display. Its been giving me headaches. Searched around and found multiple threads of the same issue. Also noticed that the left side of the monitor was also hot to touch. And it was only the left side that was hot, around the area where the first line began. I have yet to go to the authorized apple reseller as it only occurred a few hours ago. But have now sent feedback. Will update once i have some news. Hopefully this gets covered.

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I'm having the same problem. It started yesterday suddenly, showing horizontal lines and flickering. I restarted the computer, and then the black spot appeared in the upper left corner (it's extremely hot to the touch). I'm very disappointed because it's clearly a design/hardware issue that more and more M1 iMacs are experiencing. I'd like to believe it's not something planned, but Apple should at least respond with a product repair or, at the very least, a large discount on the repair. In fact, repairing the screen doesn't guarantee it won't happen again.

It seems this problem has been occurring more often since 2024 with M1 models, but if they use the same flawed design with other iMac models, it's only a matter of time before other iMacs start experiencing the same problem.

I haven an appointment today with the Apple service dealer in my country.

Hello everyone,

I’m adding my voice to the growing number of iMac M1 owners experiencing persistent horizontal lines across the display.

• My iMac is the 24-inch M1 (2021).
• The lines appeared suddenly and are worsening over time.
• When I connect to an external monitor, the issue does not appear, which suggests it’s a built-in display hardware fault and not a GPU/software issue.
• The lines do not appear when taking a screenshot, which suggest according to the apple advisor on the chat that it is a hardware and not a software issue
• I’ve seen many others here and on Reddit/MacRumors describing the exact same problem, often 1.5–2 years after purchase.

This seems to be a widespread defect, not accidental damage. It would be great if Apple could officially acknowledge this and provide support—whether through a repair program or extended coverage.

Has anyone here successfully escalated this with Apple Support and received a repair (in or out of warranty)? If so, could you share how you approached it?

Thanks for any advice, and I hope Apple is listening to the many of us dealing with the same display failure.

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

Apple Service Programs - Apple Support

Exactly the same issue happened starting yesterday, been talking to Apple support and kept asked me to bring it over to Genius Bar

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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

Exact same thing, the top left corner gets extremely hot as well. Take it to service center! make feedback on official apple channels!

Same issue here. iMac 24" M1 2021. Used for 2.5 years. The Apple Store staff suggested me to leave a message in Apple Feedback and let the people higher up look into the issue. The staff can't do anything if it is not in the Apple Service Program.

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.

Same issue with my iMac M1, after two years of usage. Horizontal lines mostly from top to bottom, and flickering screen. Sometimes the upper rim corner gets too hot to touch. I sent feedback already. I'll take my Mac to service as soon as I can.

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.

I had this problem, now the screen doesn't work anymore, the screen has gone black at the bottom, you can't see anything... it's unusable now. This is called "planned obsolescence", it's not acceptable by the Apple brand.

This must surely be an extended Apple service program.

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