Loud fan after resetting SMU

I have a brad new 20" duo core imac and I just reset the SMU and now I have a very loud fan. Anyone know how to reset it back to the normal speed?
Thanks, e
G4pwrbok, iMac Duo Mac OS X (10.4.6)

I figured it was something easy. Thanks a bunch (my ears are still ringing)
~edmo

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Loud Noises after reset of SMU

I just hooked up my iMac today and the built in iSight went black on me. After reading a little bit on these forums, I reset the SMU by shutting down, removing power plug, waiting 10 seconds, plug power cord back in while holding power button, then starting back up. The iSight works fine now, but there is loud noise which appears to be the fans or maybe hd or processor? It is on while starting up and still is on at this moment. It was not nearly this loud before I reset the SMU. I tried restarting, shutting down and turning back on and its still loud. Whats could be causing my problem and how would i fix it? Thanks

The Intel iMacs do not have an SMU, those instructions are for the iMac G5s. The Intels have an SMC. Here are the instructions.
How to reset the System Management Controller

Very loud fan after suspend mode

Hi,
i installed the current arch version on my sony vaio laptop.
when i close my laptop the machine goes into suspend mode. when i open the laptop, after 3 seconds or so the fan starts. Very very loud.
I had the same issue under ubuntu. after some googling i found some forum entries about a bug within the kernel.
the output of sensors shows me that everything has no critical temperature.
Has anyone same experience with noisy fan after suspend mode?
Thanks
Marko

It will or can happen but you can reduce it somewhat maybe using SmcFanControl (2.1.3.1 - wwww.macupdate.com ) to keep the fans above default by 200 rpm. And run Hardware Monitor to monitor temps as well. They may be running much warmer than they could/should/ought to.
1GB and your system was on starvation express! ouch. 4GB is more of a normal minimum even. 4 x 1GB is nice balanced setup. 2GB DIMMs might be warmer, run 70C perhaps. And they use about 15W each.

Loud fan after logic board replaced

I just had the logic board replaced on my 17" iMac after it would not power up (apple did it for free because they said it was one of the defective boards). The fan now is VERY loud. I have tried reseting the SMU, setting the CPU speed to something other than automatic. Nothing seems to work. Top say the machine is idle 95% of the time... Before the board was replaced it was VERY quiet... Any ideas?

fxmBoston-
Greetings and welcome to the Apple boards.
Miriam is right. Take it back and have it repaired correctly. We have good consumer laws in MA so they have three chances to get it repaired correctly or they owe you a refund or a new machine.
Be firm yet polite.
Luck-
-DaddyPaycheck

Loud fan after cover removed

G5 dual 2G PowerPC
Purchased late 2003.
I removed the air deflector while the machine was running (yeah, I know: don't do that.)
Now the fans are running full blast, and there is a red light glowing behind the grill.
I tried the procedure outlined here:
http://docs.info.apple.com/article.html?artnum=300351
a.k.a: Power Mac G5 (Late 2004): Fans remain loud after air deflector door is replaced
This procedure not seem to help - I tried it 3 times.
Should I reset the PMU?
Is there any risk / downside to resetting the PMU?
Thanks fo - rummers!
Matt

Hi, and a Warm Welcome to the Power Mac G5 Forum!
A PMU/SMU reset (photo at the bottom of the page here - Note static precautions) may fix it
http://docs.info.apple.com/article.html?artnum=300341
and shouldn't cause problems.
If, after the reset you still have the roaring fan and red LED, there is some discussion of the 'Air Deflector Door' sensor here, and in the links
http://discussions.apple.com/thread.jspa?messageID=5209299#5209299
Please post again if you have any questions. Good Luck.

PPC G5 quad will not start up after resetting SMU AND PRAM

Hi folks
I been having issues with my G5, where it would freeze up unexpectedly and then the fans would come on full tilt.
I received some advice about resetting the SMU and the PRAM.
Now my mac dose not get past the grey screen. I have to hard drives attaches one has OS 10.4.11 the other has Leopard.
Odd thing about the Pram is I never got the mac to re-chime.
Also I was advised at the apple store to disconnect power for 30 sec and then hold the power button on for 20 sec after the restarting. I heard an odd tone and then the fans came on.
Btw this model does have the SMU button which I pressed when the power was off.
As the unit will not run with the fans removed.
Any suggestions?
Much appreciated
12 gig of ram in the 8 slots. All FireWire , Ethernet and USB disconnected

There is a battery that makes the PRAM work. You may need to replace the battery.
You may also need to limit your RAM to two 1 GB modules, making sure they are made for the PowerMac G5 of your machine's age. Not all 533 MHz PC2-4200 DDR2 SDRAM. will work with the machine, it has to be specifically made by the age of the Mac model, and Mac model name according to the vendor. Thus if you have a Quad Core Mac from 2005, that's what you need to buy RAM for. Do not buy 533 Mhz PC2-4200 RAM just because it says it is that.
http://www.crucial.com/ and http://www.macsales.com/ specify the model and age of Mac in their store.
Others may too, but do not have ValueRAM or non-lifetime warranty RAM.
Lastly, your model may have liquid coolent that has run out or gotten old, making it not boot. If unsure where it is, ask an authorized service center. Some have leaks and won't boot at all.

Extra loud fans, SMC reset didn't fix it. Almost gave me a heart attack.

So my imac (2011) seemed to have started to get extra hot lately, assuming due to a game I was playing. As a result, the fans have been super loud and going at full power, even though I stopped playing the game out of concern for my Mac. They go like that even if it's sleeping now.
After some investigation I saw that it was suggested to do an SMC reset. I did that, and then the Mac didn't power on at all after that. OH NO. Pushed the button and nothing happened. I tried a few things, including trying the SMC procedure a couple more times just incase I was doing something wrong and it just didn't turn on.
The good news is that I left it unplugged over night and this morning plugged it back in and pushed the button and it came on. THANK GOODNESS. Although the fans are still loud and now I'm concerned there could be a greater issue at hand because I have no clue why it wasn't turning on last night.
Any thoughts on this? Does it sound like there is just some hardware issues I need apple to take a look at or is this something I could potentially remedy? Should I be concerned about the issue of my Mac not turning on last night after the SMC reset?
I appreciate your time and feedback! Thank you!

That may be it. I need to take it to apple. The Mac was fine but just this morning my power went out and when the power came back on and I tried to turn my Mac on the same thing happened. It just wouldn't turn on. I'm really really hoping leaving it unplugged for some time it will come back on again like last time. I don't see why it wouldn't but you never know.

Problem Fan after reset SMC

Hi All,
I'm getting mad. Just few days ago my Mac died during a skype conversation and it was the logic board, now fully substitute from Apple.
Now I have a different problem, during youte or something that take a lot of memory the temperature grow up quickly and the computer shuw down.
I've tried also to reset SMC but nothing...the temperature is very high (85) and the fan is always 2000rpm...what can i do befor bring back again to apple?
Best Regards

Problem solved by my own. But do not how :) magsafe again working and the laptop tooo

MSI GT70 Loud fan after clean reboot

Hey,
Got a rookie question.
I've done a clean reboot of windows 8.1 and I've noticed my fan is louder than it used to be idle.
It's almost running at the same speed it would be if I'm gaming.
Sorry if the answer is blatantly obvious I'm still coming to terms with the way things works.
Thanks in advance!

Did you install any applications recently?
They may have some background processes which will gradually consume your CPU/GPU resource and make the fans louder.
Or, maybe it's time to clean the fan.

HP Envy 17 3D Loud Fan after Bios Update to Ver 06 Resolved

I recently updated the Bios (06) in an effort to solve a problem (sp56416.exe). Shortly thereafter I noticed that the laptop fan would come on high speed for a second or 2 and then immediately ramp down to a slower speed. This is annoying because of the startle factor and even in slow speed is noisier than earlier. Today I reloaded the old bios (05) (sp56028.exe) and the laptop is again quiet! Suggest caution with this new Bios. On another topic - has anyone else tried the Bluetooth? I cannot get my bluetooth mouse to work, although my cell phone has no problems finding the mouse and the laptop. (yes I have checked my settings and tried the laptop and/or mouse in discovery mode. Laptop just refuses to see any bluetooth device.

I wish you luck.
I shipped back my Envy 17 the day I got it.
First - it wouldn't power on. I jiggled the battery and finally got it to work.
Second - one of the fans started squealing.
Third - the fan died.
Fourth - Even thought I paid for "in home" service, HP said I had to ship it back to them for repair.
Instead, I returned it and bought a Dell. I've owned 10 Dells and never had that kind of trouble.

IMac G5 keeps freezing/crashing. SMU reset resulted in a loud fan noise.

I have a refubished iMac G5 OS X 10.6.8 desktop that was purchased in Aug, 2006. Recently it has been either freezing, shutting down completely, or the display will just shut off multiple times per day 20+ times/day. I am not interested in purchasing the $49 help from Apple. Is it time for a new computer?
I've been attempting some troubleshooting:
I have plenty of RAM- we installed more memory about 8 months ago.
Temperature running at 40 degrees C
I reset the SMU but now am hearing a loud fan sound and there is air blowing out of the horizontal vent in back of the desktop- which does not typically happen. The computer has not crashed since I reset the SMU 20 minutes ago. I'm worried about the noise.
Also, it has been really hot where I live, with a heat index of 110 today and I don't have air conditioning. Current indoor air temp is about 86 degrees F.
Also, I have been seeing thin horizontal stripes across my screen for the past few months, related or unrelated issue?
Thanks for the help!

Not that this will cure it but it may help:
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

Macbook pro not turning on after SMC reset. I have the following problem. Yesterday I noticed that my mbp 2011does not sleep when closing the screen. smc due loud fan and an X on battery symbol

Yesterday I noticed that my mbp 2011 dos not sleep when closing the screen cover. Today I Turner my laptop in. However the fan was working loudly and stayed loud. After Start I noticed an X on Battery symbol. Clicking on it, it showed 'no battery.' I found out that a potential solution for this problem was SMC reset. I also noticed that the leds on magsafe was not lightning. Despite this I tried to execute the smc reset as described on apple support site. Switching off, plugin the magsafe connector, pushed the buttons shift + alt+ ctrl + power. Then i pushed the power button, but my mbp is not turning on. I pushed several times on the power button but nothing works. The magsafe is also dark meaning the leds not lightning. Can anyone here help me on this ?

Problem solved by my own. But do not how :) magsafe again working and the laptop tooo

Mac Pro loud fan noise after 2-3 hours

Hi. I bought a Mac Pro quad 2,66 with 5 Gb ram for about a year ago. Everything works well, but after 2-3 hours the Exhaust and CPU fan starts to raise and when checking iStat it stays at about 3000 rmp for Exhaust and CPU. The noise is bad...This happens even if the Mac is not in use (any programs running) The temperature inside the Mac is low - about 30 degrees (Celcius) and the fans do not slow down until i restart the Mac. I have tried the Reset of the SMC. There is no difference after resetting the SMC....
Any suggestions??

I have been dealing with a Mac Pro for the past 6 months in my sound studio having a constant vacuum from the fan. I assumed this was normal and a purchasing oversight I made. It was far from silent, infact it was so loud it sounded (on recordings) like a car was constantly in the room idling. Very annoying.
I took apart the mac pro thinking there would be maybe dust (as people suggested) in my video card - as that appeared to be where the sound was coming from. I removed the card, and there wasn't really a build up of dust.
I did however put the card back into a slot (it was on the bottom slot closest to the ram - maybe it couldn't breath?) and turned it back on and for the first time since October 08 I have the computer I paid for and not an oversized noise box.
So there is obviously something dodgy about this ATI card Apple. Its actually really quite annoying and dealing with a nuscense noise for 6 months on a computer you drop thousands and thousands for is just ********.

Won't boot, loud fan noise after kernel panic?

So I got that kernel panic screen yesterday, turned it off, and now when I try to turn it on, the screen remains black and the fan comes on really loud. After about 30 seconds it stops. I tried inserting the original disc, but it won't go in the whole way. I've been using the laptop pretty heavily lately, but haven't damaged it that I know of. The battery has been dead for a while now - relying completely on the adapter.
Any suggestions would be appreciated!

I have a similar problem. My son was using the computer at the time so I don't know if he saw the kernel panic. The screen is black and the computer won't boot. The fan runs loudly and doesn't stop. The battery is relatively new, about six months old. I've tried plugging in an external monitor but there's no signal.
I have tried two different power adapters. One has showed orange and quickly went to green, then the light went out. The second adapter is third party but it seems to be getting power to the Mac. To complicate matters further, there is a DVD stuck in the drive. If the Mac is dead, I'd like to at least get the DVD out of the drive!
Thanks in advance for any ideas.

G4 not starting up, black screen, noisy fan, chimes OK then nothing, after a few mins very loud fan!

Anyone else had this? On start up chimes as normal but screen refuses to come on. Have swapped monitors and same happens on the newer one. G4 was making noises before last week with very loud fan cutting in from time to time. Got lots of work on that computer! Typical, not all backed up! Is it the logic board? How much does that cost to sort out?
Thanks for your help

Hello, it's going to be tough to find anybody to work on G4s these days, Apple doesn't.
Have you blown the dust out lately?
Does the Video card have a fan on it? Does the fan spin freely?
If worse comes to worse, you can pull the drives & get the info off of them with one of something like these...
http://eshop.macsales.com/item/NewerTech/U3NVSPATA/

Loud fan after resetting SMU

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