imac 2021 buzzing noise

i'm not fortunate enough to have anything M1, but i'm pretty sure that with only flash storage in them it shouldn't be making any noise. my intel iMac 19,1 is 100% flash storage and it runs absolutely silent. i'm positive that you should be Contacting Apple for support and service. buzzing noises are very likely abnormal.

Disabled Ethernet but that did not make any difference. I have found a temporary fix but it is not the ultimate solution. By disabling auto brightness and increasing brightness level to about 75-80%, the noise goes away. It will keep the display at fixed brightness but at least I don't have to listen to those annoying sounds anymore till I can get in touch with Apple.

It's definitely not normal and shouldn't be happening. I reached out to Apple and they replaced my mac. Replacement iMac is working like a charm without any issues. I would recommend you reach out to Apple support and report the issue.

Hi,

thank you for sharing your experience. Guess i have the same kind of problem. just want to ask if your problem can compare to mine?

I've also got the M1 iMac, so I hear a buzzing sound and also can locate it, if I put my ear direct over the ports (behind the screen) iam pretty sure that is the spot where the sounds come from ... so what I have figured out, when I lower the brightness to 85% and below, then you can hear the buzzing sound, but when iam at max brightness it is dead silent.

until now I did not change the power cable position. will going for that.

my response above that the new iMac should not be making noise was recommended by apple. if you are hearing noise, buzzing or otherwise, please get a hold of apple ASAP. it is not normal.

Contacting Apple for support and service

JoVerb5 wrote:

Apple, try to fix this please.

it's up to you to contact apple about the buzzing. if you've not noticed in the other responses, (especially the "recommended by apple" response that i gave) buzzing noises ARE NOT NORMAL. you should definitely be Contacting Apple for support and service. it appears that it is an issue that cannot be fixed with a software update. re-read the other posts and you will see what i'm saying. others have been told to return their "buzzing" M1 iMacs. if you choose to not contact apple, that's a mistake on your part.

I just got mine replaced, and it is not doing the noticeable noise anymore. Though if you are in a perfectly silent room and really get your ear close to the chin, you'll hear a slightly changing noise when changing the brightness. Barely noticeable, but maybe that helps for your diagnostic.

It's true that some people will not notice the noise when its "loud", either because of the environment or hearing impairment...

They're all like this, there is no fix and there is no point in having it exchanged. To Apple this level of noise is considered normal. I would only consider it a problem if the noise is REALLY strong, I mean 30/40dB strong and audible with room noise at 1 meter distance. But if you just hear a faint buzz at night or in a quiet room then don't bother, they're all the same in this.

i doubt it was caused by an update. but, once again, noise from a new iMac is not normal. it is an issue you should be contacting apple about ASAP. best of luck. :)

The same here. Thank you all. So I'm not alone. Screen brighnes at 80% or higher solves the buzz noise. But that is far too bright for me. Apple, try to fix this please.

Update, I did a restart and the sound went down considerably even at low display brightness.

That’s exactly my case. It’s like a mosquito and it drives my totally crazy (in the silence of my room, mainly at night). I’m almost sure it’s caused by the LCD inverter. A solution could be installing a little app which reduces the brightness of the display (leaving the brightness bar at the maximun in the Mac settings) but I’m not gonna spend this amount of money on a faulty Apple device! Today I’m gonna give it back to the Store…

Same problem here. At full brightness no noise, but <60% it is here and changing by changing the brightness. LCD inverter is indeed probably the problem. I will not have this noise around myself for the rest of the lifetime of the iMac!