Horizontal grey bar on my M1 iMac screen

For the past 2-3 days I have been seeing a greyish bar on my M1 iMac's screen. After a few hours the grey bar starts to blink on & off, sometimes disappearing entirely but reappearing again after a 'wakeup from sleep'.



What exactly is happening here? And what can be done to fix this issue?


And yes, I did the obligatory restart/shutdown etc. but this grey bar still appears.


iMac 24″

Posted on Aug 20, 2023 11:35 AM

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Posted on Nov 13, 2024 10:57 AM

There's not much you can do as it's a screen hardware problem (unless your're still under Apple Care).


The following topics illustrate the Silicon M1 iMac Display problem:



Being a hardware problem the only fix is to pay for a new screen and that is prohibitively expensive. If it gets too disruptive to use you could get an inexpensive 3rd party monitor to use and reduce the brightness on the iMacs screen.


27 replies

Aug 20, 2023 12:08 PM in response to Varunprakash

Mate, instead of repeating the standard stock answer where prob 90% stated is not applicable in any way shape or form, maybe you or someone else can actually help me to find a solution to my particular issue?


No, my computer screen is NOT turned off and no, the display brightness have NOT been reduced.

And I read someplace else there is no SMC reset for M1 macs.


There is a greyish bar on my turned on, display brightness on, 'non sleeping' M1 iMac screen.

If you or anyone else are familiar with the solution to this exact problem, can you tell me how to get rid of this please?



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Horizontal grey bar on my M1 iMac screen

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