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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″
If your Mac doesn't wake when you expect
Your Mac might pause a few seconds before it wakes up. If it doesn't seem to wake at all, check for these possibilities:
Your screen brightness might be turned down.
If you're using an external display, your display might be turned off.
Your Mac might be in safe sleep. To wake from safe sleep, press the power button.
Check for a sleep indicator light, if applicable, and make sure that your Mac isn't turned off.
If the previous steps don't work
These additional steps may help identify or resolve the issue:
Disconnect external devices other than your Apple keyboard, mouse, and display. If that resolves the issue, gradually reconnect your devices, testing each time, until you find the device that is interfering with sleep. Then check the documentation that came with the device, or contact the device manufacturer.
Start up in Safe Mode to see if the issue is related to non-Apple startup items, login items, or kernel extensions.
Try to isolate the issue by using another user account.
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?
Looks like a graphics card problem. Have Apple examine it.
He's just trying to help and has no idea what you think is appropriate or otherwise.
You are free to ignore any post you feel is irrelevant or does not apply.
Good luck identifying your issue's cause.
That's fine. The thing is a good many people have gotten into the habit now of simply copy pasting numerous stock answers that has nothing to do with the problem or even the device at hand, a very frustrating part of this community thread now.
The new iMacs's have integrated graphics built into the M1 itself so the repair will prob be basically the replacing of the entire board. One of the 'joys' of Apple's obsession with slimming and integrating everything! However I am personally leaning towards this being an issue with the screen itself.
Yeah, looks like I need to have Apple examine this. Still, Thanks for your attempt mate.
Did you solve this problem? More and more users are reporting similar issues with 24' M1 iMac.
Had similar issues. A grey bar appears at the bottom of the screen and blinks. Many people had the same issue and Apple just did not fix it.
[Edited by Moderator]
Sadly this is a hardware failure. Not software. It will require screen replacement.
Horizontal grey bar on my M1 iMac screen
