Persistent horizontal lines appear on iMac screen

I wrote in one more time:

"One of my iMacs now shows horizontal lines across the lower display. Apple Store said it’s a hardware problem needing a costly screen replacement. Support later told me it’s just an expense after three years. That’s unacceptable. I’ve since found over 700 users reporting the same issue, likely tied to the iMac’s design and brightness management. As a loyal Mac user for 35 years, owning more than 22 Macs, I expect Apple to take responsibility. Please issue a repair or recall—loyal customers shouldn’t bear the cost of a widespread defect."

Fingers crossed.

If this is happening to you too, speak up. Write in the forum. We need to get Apple to accept the design flaw and cover the replacement.

Sad to say , even replace the Screen this Line issue will come back After one year or so. Is all due to design Flaws in this M series iMac.

I kinda shock this issue first report from M1 iMac user. As I using M3 iMac which I bought in Feb 2024 also encounter it. Just coincidence after using it for one year !

Given a 100% fail rate (same display issue) of my four M1 iMac computers, I am pretty sure this is a wide spread issue. As all M1, M3 and M4 iMacs are having about the same design, I'd expect there will be increasing number of similar cases.

Nonetheless, I don't think Apple will admit the issue due to cost and reputation concern. Granting a Service Program means Apple admitting a design flaw in Apple chip iMac series. More importantly, it also means it admits the flaw was not addressed for a few years.

Although Apple will refund the repair cost if a Service Program is issued, but I think many affected users will just look for other solutions (e.g. connect to external monitor, switch to Mac mini).

I guess Apple will just change the circuit design in next generations of iMac, but it will not grant a Service Program soon. It may grant a Service Program after most affected users disposed their affected iMacs, so as to minimize the P&L impact, yet claiming its' goodwill in customer service.

Anyone with this issue should really call Apple Support directly. The support person will document the issue and Apple Engineers will see these reports. You can slo provide information on the product feedback page but calling them is the best method.

Please let Apple know that this is a major issue:

We all have to make a feedback form with this link:

Feedback - iMac - Apple

You have to make an official complain:

Feedback - iMac - Apple

Had the same issue. And it got fixed after two weeks of very low use. I added a second monitor and had the iMac with the lowest brightness possible. And one random day, it came back to normal.

Would you mind posting a photo of the problem?

it will be good to get as many photo evidence as possible. Thanks

This just a discussion forum. Please post your feedback to their site. Feedback - iMac - Apple. I did the same may be that way they will know so many users are facing this problem.

--

AC.

Please post your feedback to their site. Feedback - iMac - Apple Feedback - iMac - Apple . I did the same may be that way they will know so many users are facing this problem.

Hi, could those of you who have this problem check where your model was manufactured? You can check under the base/foot/stand, there should be a label that says 'made in' or 'assembled in'.

We are only users that help other users. For Apple to hear it you need to post feedback:

Product Feedback - Apple

I’ve been having the very same problem for a very well maintained 24” iMac M1 purchased in July 2021. This is very clearly a manufacturing defect. There’s no reason for a lot of people to have this issue pop out of nowhere exactly 2 years later. How do we go about claiming manufacturing defect? Any advice would be valuable. Ain’t no way am I going to pay 600+ dollars for a defect that took only 2 years to pop up.

Have the same issue on my iMac 24" 2021. Started with lines at the bottom, shutdown and it was gone. After some time, it came again, shutdown then gone again. Then the 3rd time, it came again and never went away. Even I shutdown my iMac for a month, the lines are still there.

I went to Apple Service Center and they quote me S$900++, way very expensive. So just went back home and try to make use of the iMac even if the lines at the bottom are very disturbing.

This might be some issue on most if not all of the iMac M1?

How can we escalate this to Apple?

I was quoted around $700-800 at apple store MBS. I spoke to a third party vendor. He told me the problem lies with the monitors, probably defective. My screen has completely blackened out and I am relying on an external monitor to do my work. It has got nothing to do with software. low quality monitor issue