“I hear this loud humming noise” *Pans out to a wider angle with dramatic techno music in the background*

Actually, it's not the fact that you are using another power outlet. It's because you reset the (Systems Management Controller-SMC) by unplugging your computer for 20 seconds or so. This is how it's done for Apple desktop models. If the CPUs get too hot and the fans spin out of control, your computer is designed to crash and restart. It's a precautionary measure Apple designed into their product as to protect the computer from a massive heat attack. Unplugging the computer resets the SMC which also resets a plethora of other issues. By reseting the SMC, you got your rogue fans to behave normally.

Thank you! My computer’s fan was loud the minute I turned it on this morning. I followed what you said and just like that - quietness 😊

Wow! Unbelievable. My fan was causing me to stay away from my iMac ( which I love). I followed your instructions... Instant silence! Thank you so much. ❤️

Thankyou so much, this worked! I'm writing my thesis and had to use earplugs at one point because of the loud noise. Thought I was going mad.

We were watching your video to trouble shoot our computer. We had tried unplugging it like you were doing. Turns out it didn't calm the fan till half way through your video but I'll still give you full credit.

Jonah I am so grateful to you. This problem fan noise just happened when I moved my computer from one room to another. Then I followed your instructions and it worked. Thank you so much!!!

It works! thank you so much, it's been months and I finally found a solution. You rock!

The reason I’m here is because I searched on “iMac with loud fans” It worked, I moved my power cable directly to my surge protector. 👍🏽 back to normal 👍🏽 big thanks I was just about to tear into my machine. Great fix thanks.

I am amazed at this resolution. I have parallels set up on my iMac and play hidden objects games as well as use it for work. Since I have had this new iMac it has been running the fan real bad. I unplugged it from the surge protector and plugged it in to a power source by itself and instantly the fan is running correctly. Thank you so much for this.

Thank you. I was confuse of why my “MacBook air,” fan was goin’ nuts... and this video was the right choice; And again... Thank you!

I was so desperate with my desktop, and I followed your instruction, it worked. Thank you sooooo much

THANK YOU! I tried everything. SMC reset, PRAM, etc. It was driving me nuts. Your solution worked.

Keeping the brightness down and closing unused apps helps it keep cooler as well. thanks for the upload Jonah!

Just wanted to say thanks. My fan was noisy always, so plugged directly into plug socket instead of extension cable and fan noise eliminated. Fantastic

When “Change the outlet” could’ve been said instead of watching all this

I was looking for a solution for days, this worked thanks so much

Thank you, fantastic. We had a power blackout and power return surge and when I restarted my Imac there was the fan. Tried another outlet and we're up and running quietly, Thanks

I can't believe it WORKED!!!! I was already looking at buying a new Mac because it's been 5 months loud noise, so I figured my Mac is probably old (My Mac is 10 years old). I can't believe that was the problem!!! I just unplugged my 6 wall extension thing, and plugged my Mac directly to wall and Noise is GONE!!!!!!!

It’s worked! Thanks so much, I was just playing on my computer and had to restart it. ( My computer crashed ) and then the fan was on!? I was actually panicking thinking it would explode, XD. I looked up ur vid and boom! It works now!

Oh my god Thank you so much!!! I had headaches for months cased by this loud noise!!! OMG

Thank you and I did read the explanation below. Had this issue for one week... it's been cleared up because of your video ... thanks again.

I had 0 faith in this working, but gave it a shot and it actually worked! Thanks dude

Yes, ... of course ... another outlet. I had also been suffering from a fan that was making a lot of noise for some time. Finally opened up the 2019 iMac 27", carefully blew all the dust (and it was a lot) out with a compressor, disassembled the fan, took it apart and cleaned it nicely. I did not hear the iMac anymore and the fan runs quietly in the background. I taped the monitor at 6 points with strong black tape because then I can clean it regularly. Not pretty but effective.

Thankyou Johnah, this solution worked for me,we initially thought it could possible be a virus, and after running a virus check we found nothing. After watching your video and swapping to another outlet it stopped the fan noise.

Thank you so much! Unplugging for 20 seconds actually did the trick. Really appreciate!

I plugged my max into another outlet, and it worked. Your a star

Hello, … *music… there’s a problem… *music… with my… *music… computer fan… *music

Thank you!! Your solution worked just fine and very fast!!👏👏

This was painfully slow but this actually worked thank you

CHANGING THE OUTLET WORKED! AMAZING! YOU ARE THE BEST! THANK YOU!

thanks for the detailed video, helped a lot :)

Perfect brother! Thanks a lot!

Moved power cord from surge protector to wall outlet . . . problem solved! I don't have surge protection now. It's a '07 25" iMac, so not terribly valuable. I appreciate your sharing this solution! Much o k a y n e s s 🔆

dude ive been searching all day and u fixed my problem thank u

I seem to have the same problem but with a Mac Pro (trashcan) I've done exactly what you done cleaned it resetted it and nothing seem to happen

This is insane and 99 percent of people have lost it... Reminds me of movie idiocracy.. Its here. Think about it, just because you changed to another outlet wont solve anything, computer doesnt know your using another 120v exactly in every room all over the country. Its you unplugging your computer for a few seconds that resets the mac but eventually will return due to low memory, old mac, too many windows open, bad internal board, ssd needs to be reset and so many other possibilities but to say to plug to another outlet will solve it temporarily not because its another outlet but because you cut off power to mac but its not fixed.. folks im an engineer and to be honest it doesnt take an engineer to tell you this, common sense does and that tells me 99 percent of humans are done for...

Very helpful. Hope to try it later today.

Thankyou so much it was the surge protector creating the fan noise!

Actually worked, thanks mate!

Very helpful, thank you ❤

Life saver, thank you so much!!

it worked for a while but I'm still hearing it. I went and purchased a new Thor power board but still no luck. Fan speed is on low currently running at 1200 RPM and all the CPUs are sitting at around 50c Deg which is fine. May have to just put up with it or plug my headphones lol

The way you did it doesn’t really mean anything though. It wasn’t a proper test. Had you plugged the Mac back into the original socket and left everything as it was that would have been a test. Because if the fan started up again, then ‘maybe’ it was because you had so many devices plugged into one extension 🤷🏻‍♀️ My fan started blowing full blast and extremely loud as soon as I switched mine on this morning (it’s been fine for hours at a time, nowhere near warm let alone hot and the fan didn’t do that at all, didn’t hear a thing from it). I had to restart it, that’s didn’t work. So I turned it off, turned the power to the extension off and removed the iMac plug. I left the 2 plugs I had in this 4 plug, 4 USB extensions exactly as it has been the entire time. Then I plugged my Mac back in, turns the power on to the extension and turned my Mac back on. No issue at all. So can’t say it was the extension and too many other plugs being used at the same time, just going off your video. Sorry 🤷🏻‍♀️. That’s not to say that it is at causing the issue, but you can’t tell yes or no from what you did that’s all 🤷🏻‍♀️

Anybody tried a SSD Fan control App and the magic worked? Which app was it and what was your experience?

just a heads up: that's not a surge protector. i had one of those exact Mastercraft power bars and it broke. i opened it up to see what was inside, and the incoming wires were connected directly to the outlets. so if you wanna protect your electronics you'll need a different power bar

Very helpful thank you 🙏

Thanks, it worked for me as well, I was not sure it will go to work but it did :)

You smart and wonderful man. Thank You!

Thanks man, it actually works

Thank you!

WELL THANK YOU FOR SHARING

Hello Jonah! Thanks a lot for the hint! It works! The fans are working properly! Thanks a lot in advance and best regards.

Any update ? Did it stay quiet ? Have you tried the surge protector again to check?

It’s works!! Thank you so much 😊

It's working! Thank you man

Great! bro you are a genius

When you’ve been looking for like 5 days on how to fix it 🤦🏾‍♀️. Just unplugged and put in another plug. Unreal! It was driving me absolutely INSANE.

Thank you so much

I try this on my Imac 27 from 2011 and it work..thanks...i was so mad at the fan that was going full speed all the time....brrrr.....:)From what year is your mac?...

so you gonna plug it into another outlet.

Really works man.. Superman.. Thankyou..

Thanks so much.. It worked..

i also experience this one, thank you for sharing this at least i have an idea now

Mind fan started running The minute I plugged in my printer turn the computer off Unplug the printer restarted computer no fan noise. That’s a simple fix thanks very much

Thank you. It helped. :)

I just purchased the new iMac 27” and tge fan runs if I’m only have 4 or 5 browsers open 😮

Thanks you helped alot

THANK YOU!!!

Omg tysm, it worked I just needed to replug

Thanks so much

it worked! thank you!

Worked. Thanks

Here in the UK, we have a different electrical system but, just unplugging and changing sockets worked? STRANGE.

Thanks it worked!!

I tried your solution and when i open it , the PC is.not opening at all !! I changed the plugs of the PC the same it won’t open ... is my data in PC will get erased ! ? :(

Great video

I was skeptic all at first but it actually works

My Mac just turned off randomly and once I booted it back up again, it started doing *that.*

I've done it all, even downloaded a few 3rd party fan control apps... nothing. My fan will not shut off. Running at full max. It is driving me nuts.

THANK YOU! Problem solved!

Thanks !!

Thanks man it works 😁

I tried it, and it work, thanks, I was so worried

I don't understand, why this can fix the problem? what is the theory behind? thanks!

What sort of RAM do you have in your iMac?

Tysm it worked

in short - try changing power outlet. Thanks

I though my mac gonna explode anyways thanks for help

Omg, I love you man! I thought my mac was breaking down and I would loose all my work! Bless you my friend.

how about hearing the noise and not the crappy music?

my brain refuse to believe this! i will try and repost the results soon

it works, but last time ,I just turn it off the power and start again, works also, on the other hand, that noise helps...it blows all the dust...I thought its autocleaning process

What is surge protector my teacher ?

I just plugged mine into the wall outlet instead of extension cord and problem solved ❤️ thank you

thanl you so much i tought i would explode even do thats not rly possible

Okay, everybody is thanking the solution, but I don't have an imac still, I was wondering about the possibility to buy one, and what I see is that Apple needs the user to unplug the power cord to fix temporarily a bug/problem/hardware failure that will happen again and again and again? Too weird. I would have wanted to move to a iMac because of avoiding the typical pc tower noise, but, now I think that a monitor / front noise may be much much worse than a tower noise that you can keep far from you and down in your legs, not in front of your ears/face.

thanks a lot. I can't believe it, lol

wow this worked letsw see for how long

U just solved issue from 13K kilometers. “I’ll call u my lord my lord”. Black adder s1e1 💁‍♂️