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.

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.

Do not tilt the screen down too far and there have been instances of iMacs over heating when the screen was tilted too far down and blocked the air vents in the back with the stand.

Is it the cable or the receptical in the back? If a cable I'd ask Apple to replace it. If the receptical in the back I'd contact AppleCare for a fix or replacement.

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.

I have the same issue on iMac M1 (8 Core GPU) and it is driving me crazy. My apartment is very quite and I stay up late at night, which makes the sound even more noticeable. First I thought it was the fan but now I think it is the electronic circuit making humming / hissing sound. The sound seems to be coming from the bottom of the screen, the chin, towards the centre and that's where the logic board is. It starts as the Mac is turned on and is only masked if the speakers are in use, otherwise it does not stop till Sleep / Shutdown.

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…

Indeed! It is very frustrating, specially when you spend that much coin on a new machine. I’ll contact Apple support as soon as I can but since Melbourne is in Lockdown again, I guess I’ll have to wait for another week.

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.

Hmm. Wonder if the problem occurs with the base iMac that doesn’t come with Ethernet. Anybody? Either way, a troubling start to an otherwise grand machine. Let’s hope the fix is something trivial. Good luck!

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!

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.