iMac display flickers since I have upgraded to MacOS Sequoia 15.3.1

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iMac display flickers since I have upgraded to MacOS Sequoia 15.3.1

Since I have updated my iMac OS with Sequoia 15.3.1, the whole display flickers. It started just after the OS upgrade and all was working fine before. I have run an auto-diagnostic as well as re-installed the OS and it did not fix the issue.

The flicker is happening throughout the whole display, and not just a given app.

When I am stoping using the iMac, the flicker stops, and start again as soon as I am moving the mouse or hitting the keyboard.

No other lines are appearing on the display.

I have called Apple Support and they advised me to check-in with a specialist at the Apple Store, which I'll do in the coming weeks.

Is anyone else facing the same issue ?

My iMac specs :2021, Apple M1 and 24 inches.

iMac 24″

Posted on Feb 17, 2025 2:17 AM

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Answer 1

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Frinevalz Author

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Mar 9, 2025 10:37 AM in response to Frinevalz

I am following-up on this one as the issue is now solved and it may help others: it had nothing to do with the OS update but a hardware issue. I had my logic board changed at an Apple Store and it fixed the display flickering. I was just not prepared to change a logic board on a 4 years old computer.

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Answer 2

Old Toad

Level 10

217,802 points

Mar 9, 2025 1:42 PM in response to Frinevalz

It appears that you may be experiencing the beginning of the 24" M1 iMac display problems. 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

Installation of Sequoia may have pushed it over the edge. I recommend you make an appointment at the nearest Apple Genius Bar for a free diagnostic check. Others that have done so have reported back that the cost of the fix would be around $600 US and unless you have AppleCare you'll be on the hook for the cost.

So far Apple hasn't issued a recall fix for the M1s but if you take it in you'll be in their system as one of the problem iMacs.

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