New Loud Fan issue

I have an iMac G5 that had the motherboard replaced in September due to the "infamous" display problem.
Everything has been fine since then except recently, the fan slowly creeps up in loudness. I would say after about 45 minutes of light use (web surfing, say) the fan has become annoyingly loud. The only way to stop this is to either put the iMac to sleep or shut it down. And then if I start up immediately, it will be nice and quiet. But again, after about the 45 minutes, the fan has revved up to annoying loudness.
I did recently install OS X 10.4.3 and this all probably started around that time. I did not have this problem until recently. But I'm unsure if there's a direct relationship.
I have tried the few tips I've read on the boards about dealing with loud fans, but nothing seems to help. I have reset SMU, reset PRAM, reset NVRAM and also tried the MacFixit tip about changing the Energy Saving option from Automatic to something else (like highest or reduced); but none of these things have helped.
This is still under warranty and I could take this in, but I thought I'd try here first before actually hauling my machine in.
Does this sound like a fan problem, a power supply problem, an OS 10.4.3 problem? I have no idea. Any clues anyone? Thanks.

In a situation like this, H L, my first step would be to run "Activity Monitor" (from your utilities folder) , seelct the CPU tab and the "Activity Monitor" Window, and see if anything particular is hogging processor time.
You might also want to select the "memory" tab in the same application and see if any particular program is using a disproportionate amount of memory. (Safari , is one application that can actually turn into a "memory hog" when it has been running for a while.)
CPU "hogging" results in an increased load on the processor, causing increases in temperature and resulting fan activity.
Memory hogging can also increase processor load, but will eventually also cause an increase in HD temperature as more things have to be "paged" to and from the HD by the OS's virtual memory scheme. This can be a particular problem if your HD is getting fairly full (down to its last few gigabytes) as the drive's free space is likely to be badly fragmented by this time.
Cheers
Rod

Similar Messages

For anyone with newer imac fan issues.

I posted about a week ago asking for advice on my fan issue.
I was getting istat readings of 2500 - 3000 - 3500 (max has been 3850) rpms from nothing more than being on the internet. The computer is 2 months old and prior to having the computer worked on for an unrelated issue I had never once heard the fans kick on.
But now my computer sounds like an airplane trying to take off - all the time.
So, with another visit to the apple store, support-line calls and a visit to an outside apple authorized service provider - I am here to tell anyone in the same boat, that having your fans blow LOUDLY, and ALL the time is perfectly "within spec."
I'm using it right now. Only safari is open and it sounds like monsoon season with a nice consistent rpm of 2700.
I am certainly frustrated but did want to share this follow up with anyone that's discouraged with their fans since I know when I first ran into the issue I scoured the forums for info.
Are they loud - you betcha!
Are they annoying - **** right!
Do they interfere with music and video - oh boy do they!
Does it sound like they computer is deathly ill - absolutely!
Is it all 'within spec' - yes, sadly it is.
I don't see anything else I can do at this point.

@den.thed
I actually have that app. already. Its where Ive been getting all my crazy fan readings from.
The temp sensors I havent paid attention to though - which are the temp. sensors and what is abnormal?
Last time I took the computer into the mac genius(the 3rd time) - they just told me everything was fine and didnt even look at it! Then I was told by Apple Support to go to an outside service provider who also said there wasnt a problem. I had 50 screenshots of the fan at 3000+ speeds and they didnt seem concerned.
Overall I guess what im getting at is - even if it appears that there's a problem I dont even know what I can say to these people anymore!!! No matter what I say, Im told that the computer is fine. Its by far the most frustrating product/purchase problem Ive ever dealt with.
thanks for help so far though.
Anyone know how much I can recoup by parting the thing out?

Not getting help with loud fan issue

I have owned this iMac G5 for 2 1/2 years. A little while ago it started shutting down by itself and when I took it in to the apple Store at Chestnut Hill they replaced the logic board---and took three weeks to do it. When I got it back, it no longer shut down, but it now sounded like I was running a hair dryer at full blast. I've taken it back three times---most recently to the new Natick store, but they always tell me they can't find anything wrong and that it meets specs. (They did replace a wire connected to the hard drive once.)
I have Applecare, so it is not costing me money, but it has cost me LOTS of time without a computer---a serious problem for an author with a book deadline. And, worst of all, it's no better. I sit at the computer for long hours and it's affecting my hearing (ringing long after I turn it off) and my mental state. It is seriously loud---My mother-in-law thought she'd broken it when she turned it on.
One of the problems is that the noise levels in the Apple Store are so loud that it's hard to make a case. I'm really discouraged. we're being scrupulously polite, but it's getting harder and harder. I mean, what good is Applecare if they just make things worse in another way and then refuse to acknowledge the problem?
I need some constructive advice

Welcome to Discussions: If you have had several repairs and your computer is still not functioning properly, I would call Apple Care and gently ask for a new machine. Their policy is to replace a faulty machine after three tries. Hold the phone up to the computer and let them hear the noise. You are also entitled to in-home repairs, at the very least, have them come to your house and fix it. (is the new Natick mall fabulous?)
Let us know how things work out,

Radeon HD 3870 PCIe 2.0 overheating and loud fan problem fixed?

Hello everybody.
I just wanted to know if anybody on here has bought an 3870 lately and still has the overheating/constant loud fan issue. I have been told by Macsales that this issue has been fixed on the new cards? Is that correct? I am still shopping for a card for my MacPro 2007 1,1. Don't really have the money to buy the 4870 and the only other option I have is the 3870. Pretty sad that there are no other ones in that $200 (or less) price range. Every other card for that Mac version is in the $350-$450 range.
Anyway, just wanted to know if these 3870 issues have been fixed.
Thanks.

My experience with the 3870: I have 2 of them for 2 computers and have never got the fan issues reported all over this site. I dont think it applies too ALL 3870s'. They have been pretty much silent or close too. Its a great card with Motion and maybe I was tripping, but it seemed to make the interface a bit more snappy.
Having said that, I have removed them now and replaced them with the 8800, due to Snow leopard and support for Open CL (FYI 3870 does not support Open CL, which is a shame, why? baffles me!) not that apps support that yet, but soon.
<Edited by Host>
good luck
BKT

IMac 27" (Late 2012) Loud Fan and Overheating Issues, causing Hard Drive Failure

Hi all,
I'm having some serious overheating issues with my new iMac. Any help to help me solve this problem would be gladly appreciated since it's really beginning to bug me. Here's what's has happened:
I noticed in the first few hours of switching the iMac on that there was a short burst of very loud fan noise. This has been happening about once every two days since and every time I haven't been doing any heavy processing with the system. I've noticed that the main fan will spin, on average, at 1200rpm. Is that normal? The iMac is very well ventilated and sits right next to a window...
I have also boot camped the iMac with a copy of Windows 8 so I could run some fairly power-hungry games. I intentionally purchased a high end iMac (27" display, Intel Core i7 3.4GHz, Nvidia GeForce 680MX Graphics, 1TB Fusion drive) and expected the iMac to run games flawlessly. However, after a few days, I noticed that the CPU and GPU had shot up to a worrying 80°C whenever I ran power-hungry games, with a very loud hissing noise from the fan. After running games for about 10 minutes, the fan will stop hissing, causing the GPU and CPU to increase to 100°C. The iMac then fails and switches off unexpectedly without any warning. After analysing the Windows event logs, I received an event ID 41: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
As this occurred about six times whilst I was testing my iMac's performance, I think my hard drive has now begun to fail - sometimes I will hear the hard drive make a click noise, about once every 5 seconds. Sometimes, the clicking noise causes OS X and Windows to run very slowly (even though minimal RAM is being used and nothing too intensive (Safari, Mail etc.) is being processed). Running Repair Disk and Repair Disk Permissions under OS X's recovery mode as well as a repair in chkdsk in Windows suggests that there were no problems with the hard drive. All I can do is wait a while for the clicking noise to stop, and then performance will increase. I have backed up everything externally.
I have also performed a reset of the SMC as well as the PRAM, which hasn't really helped.
Any help will be appreciated. I will gladly provide any extra logs etc. if they're needed.
Thanks so much,
Alex.

Alex Cummaudo wrote:
I've noticed that the main fan will spin, on average, at 1200rpm. Is that normal? The iMac is very well ventilated and sits right next to a window...
That's the default fan speed on iMacs, so there isn't any problem with this.
Alex Cummaudo wrote:
I have also boot camped the iMac with a copy of Windows 8 so I could run some fairly power-hungry games. I intentionally purchased a high end iMac (27" display, Intel Core i7 3.4GHz, Nvidia GeForce 680MX Graphics, 1TB Fusion drive) and expected the iMac to run games flawlessly. However, after a few days, I noticed that the CPU and GPU had shot up to a worrying 80°C whenever I ran power-hungry games, with a very loud hissing noise from the fan. After running games for about 10 minutes, the fan will stop hissing, causing the GPU and CPU to increase to 100°C. The iMac then fails and switches off unexpectedly without any warning. After analysing the Windows event logs, I received an event ID 41: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
You must know that Boot Camp isn't compatible with Windows 8 and that Apple hasn't released drivers for Windows 8, so it can fail. Install Windows 7 inmediately until Apple launches updated drivers.
As it looks like the hard disk is damaged, I would take the Mac to an Apple Store. It's in warranty, so it should be repaired for free or you should receive a new one

My new Imac 24", 2.8GHz Intel Core is suddenly making a loud fan noise

Please help!
This Imac is only a week old. I bought it on apple online store. This is 24" 2.8GHz Imac and it's been the best computer I've ever had. It was wonderful to work and silent until yesterday. And suddenly I can't stand the fan noise coming from my new Imac. I downloaded i-stat Pro to check the status of my computer and it reads *CPU fan:1198rpm, hard drive:1198rpm, optical drive: 4401rpm*
what is wrong with my computer?
I searched many mac forums, and I've tried many things including shutting it down and unplugging everything and replugging everything after a while, but nothing solves this problem. Does anybody have experienced this problem? I am not even using many applications. I am only using safari, and the fan is at full speed. SO LOUD! What can I do to solve this? Should I take it to apple to look at it?

Hello lovingimac
Welcome to Apple Discussions
That sounds like there is something wrong with the temp. sensor for the optical drive.
If carefully following the SMC reset instructions below, does not fix the fan issue:
http://docs.info.apple.com/article.html?artnum=303446-en
Then yes you need to make a trip to your local Apple service center.
Dennis

I'm wondering if anyone else has had problems with their imac fans being extremely loud when running at slow speeds? When the computer heats up enough for the fans to run at higher speeds they quiet down. New HD fan was just installed.

I have an imac that I've had for a couple years. The fans have always been loud when running at the slower speeds. When the computer heats up enough for the fans to run at a higher speed the fans quiet down. I had installed SMC fan control after multiple attempts with Apple to get the fan issue resolved. That seemed to keep the fans quiet enough. I've never had a problem with overheating. Recently the fans were becoming loud again even running at the slightly higher speeds so I took it to my local Apple store and they replaced the hard drive fan. I got it back and it's now as loud or louder than ever!! And, now SMC fan control won't "stick." The fans will speed up, but then gradually go back to the lower "loud" levels. I'm at a loss as to what to do next.

Thanks jared,
I'm still dealing with this issue through Apple. Some time after I posted this, I contacted Apple again. They did start a case up for me, as I was experiencing the same behavior on two different machines, with two different versions of Windows.
So far it remains unsolved. I've logged iClouds for Windows on my desktop, which is brand new, then logged for awhile after completely uninstalling Norton Security Suite, depending on the Microsoft security for some time, and finally logged after I uninstalled iCloud for Windows, restarted, installed a clean download, and connected using a completely different test account, which Apple set up for me. None of this made any difference. Looking at the logs, it seems every 10 minutes, iCloudServices.exe creates a new TCP connection to confirm I'm using less than 5GB on iCloud, (which I am by a good margin, using less than 2GB), it seems this connection is not closed, and when the next iteration rolls around 10 minutes later, a new TCP connection is created. I come very close to having 6 TCP connections created per hour, until I restart my computer. This works out to... 6 x 24 = 144/day.
Perhaps the article you posted will shed some further light on this. I'm thinking seeing the state of the connection through netstats, at the least, could help.
For the last week, I've been putting a hold on further logging, as Apple wants me to create a new user account on one of my computers, install iCloud for Windows there, and log it running in the other account. This however basically means I cannot use my computer for a fair number of hours, and I've been busy enough with work the past week that I haven't the time or energy to afford to set this up and run it. I've had need of my computers too much for the past week.

Brand new U500 has a very loud fan

I received this brand new U500 (customized on Toshiba.com) about 10 days ago - everything works great (love the back-lit keyboard) - but the fan noise is a little louder than what I'm used to. I had a 6-yr old Dell XPS with a quieter fan than this brand new Toshiba machine. Basically if I'm standing 20-30 feet away from the laptop I can hear the fan, and one can wonder if this comes from a refrigerator or a vacuum cleaner working in the background.
Has anyone had a similar experience - is this fan noise something I should just learn to accept or do you think I should do something before the computer comes out of warranty? I really would hate to have to return a brand new computer, but at the same time I think fan issues only get more numerous when a computer gets older.
Just for info, the machine is Satellite U500-ST6322, CORE 2 DUO P7450 2.1GHZ, 4GB RAM, DVD Slot load.
Thanks a lot.

Hi and welcome to the  forums.
you wrote
I've read that if I installed OSX 10.4 then the fan would run quieter.
Is this the case?
No, that wouldn't make a difference. eMacs are famous for their very noisy fans.
Some say they were originally intended as turbine impellers for Boeing, but were rejected as too large. So Apple picked them up, and modified them for use in the eMac.
eMacs were made to be workhorses in classrooms and their robust design includes that heavy duty fan, which does impose itself quite loudly.
Some people have installed a means to introduce resistance to the fan circuit to lower the voltage and hence the fan speed, in an attempt to quieten it down.
Whilst this practice seems to work, personally I would be concerned about that causing overheating as during summer things can get very hot here, though perhaps would be less concerned if living in the UK.

Loud fans in sleep mode 20" G5 iMac Rev A, OS 10.4.11 New Info

This is more of a confirmation and heads up on a problem I encountered and solved to see if any of you have other ideas.
Several weeks ago I replaced the power supply bought from Mac Pro Online in my G5 iMac. When I put it to sleep I hadn't noticed anything odd at first because I'ld just walk away until one day I could here the fans going full blast. The screen was off as usual but the sleep mode light wasn't on while the fans were running. I waited about a minute until the fans returned to normal speed and the sleep mode light returned to its usual behavior only it seemed to be a lot brighter.
I awoke the iMac from sleep and all was fine. I put it back to sleep and the screen shut off as usual but the sleep mode lights wouldn't turn on. I waited about a minute and listened to make sure that the iMac hadn't shut down and then the fans started up full blast for about 30 seconds and then returned to normal and the sleep mode lights turned back on.
I shut the iMac down, disconnected all USB and ethernet cables and reset SMU using the unplug power cord, 10 second wait, replug holding down rear start button. Fixed it!
Swapping out USB devices I narrowed it down to a Kingston USB Multi-sized port memory care reader hub-part number: FCR-HS219/1. I tested and got repeated results described above reconnecting it and downloading some images and ejecting. Loud fans in sleep mode happened again.
Tried a MobileMate Memory Card Reader, downloaded images, ejected and no problems with sleep mode.
My question is what could've messed up the Kingston Card Reader? It was working fine before the power supply replacement.
Thanks,
Tim

There's no telling.
Only cause that came to mind is a lightning hit last week that sounded very close by where all it did was cause the lights in my home to blink. The computer didn't. However, this might have fried the Kingston card reader.
To give an idea of the resilience of the former power supply, about a year and half ago I had the back off with the iMac sitting upright on a towel on the table while I played a YouTube video to see if I could cool this thing down. Instead of cooling it I overheated it by blocking the vents to where suddenly the iMac just shutdown. I could detect a strong smell of melted plastic from the power supply.
Put the iMac back on its stand and restarted without a hitch and I've never had any problems until several weeks ago when it just started shutting down for no reason. It passed the LED light test as it still does now with the new power supply.
This is the first Mac out of three I've had since 1998 that allowed me to see odd behavior like this. I had to rely on my 2000 Pismo G3 PB to find a replacement PSU online. That thing never breaks.

I turned on my new imac for the first time and it is making a loud fan noise please help

I just got a new computer and when I turned it on for the first time it started making a loud fan noise. the noise seems like it is coming from the back speaker. and it does not make the noise on sleep mode.

Connect the iPad to a USB 2.0 port your computer with the cable and iTunes should launch and it will take you through the process step by step.
I assume that your computer meets the requirements and that you have the latest version of iTunes on your computer.

Clicking noise, random loud fan, brand new macbook help?

Ok. Here goes:
Just bought a new macbook 2.16, with 2 gigs of ram from an apple store on Friday. I notice that about every twenty seconds I hear clicks that sound like the harddrive is thinking, followed by a slightly louder fan, and then just as suddenly the louder fan goes away. I downloaded IstatPro and my fan would hover around 1799 but constantly go from 1795 up to 1805.
What's strange is that when it gets louder, I don't hear it go up to speed like my Imac used to do, and it's not a higher frequency but sounds like something that was in front of the vent kind of jumped to the side, and now it's just louder.
It's annoying. I would much prefer a constant 1800 whir which is actually quite pleasent.
Let me know if this is normal fan activity. Or any idea of what this could be. Besides that the computer is running great. I'm going in on Saturday and possibly asking for a new computer? Just now afraid that I might not get something better. Also the box the computer came in was really dirty, and a little banged up. Do they used recycled boxes, or could I have possibly got a previously owned unit? Thanks. sorry for the long post...

... we've got the same machine. mine's a month old; it sounds exactly as you describe. the fan noise increases with cpu load, and on mine doesn't start to bug me until around 3,000 rpm and gets real loud ~6. the last laptop I had, a win machine, was absolutely silent until I saved to the hard drive or opened a new program. the keyboard was silent too. so I got spoiled. I did about a 100 page search here and it seems common for the macbook to run noisily and hot. I haven't been able to get a definite yes or no from any genius or tech on whether the fan is designed to ever shut off, but from what I've found out, I would guess not. The cd/dvd drive crunches and clunks when it grabs a disc (there's a recording of this on the apple site indicating it is normal)and when it spins up, sounds like the machine will lift off the desk -- which I have read other users say.
take an hour and search here. between user comments and moderator replies, and the apple tech docs, there's a lot of info.
hope that helps.
--h

Loud fan and overheating issue.

I bought a secondhand macbook about 8 months ago, and recently the fan has started making a god awful noise, and it stops and starts every now and then, and my laptop is heating up. Is this a hardware problem? and will it be expensive to fix?

1) Thermal sensor issue
2) Fan issue
Try an SMC reset. See if this helps.
Resetting the System Management Controller (SMC)

New logic board...now LOUD fans

hi everyone.. i have a MBP 15". I had my logic board replaced last week due to graphics and power problems that i was experiencing. Ever since, the fans turn on to full blast (6000+ rpm) for the littlest things. If i open itunes, fans on, open word, fans on, sync iphone, fans on. Im in law school and its crazy how loud they can get in a quiet class room. my fans never were audible before this logic board replacement. anyone else have loud fans? i have owned 2 MBP's, a few Powerbook G4's, and never had fans like this. any advice would be appreciated, i dont know if apply would service it again for these fans, but its embarrassingly loud.

for the first time, i am honestly disappointed with apple. when i first arrived, i put on itunes and played a song to show the tech that the fans were at ~5700 RPM. he took it in back, came back 5 mins later, and said that he made a test account, the fans were silent, therefore its not a hardware problem but a software one with something im running. (pretty interesting because it NEVER did this until last week, and the only thing that has changed is hardware)
so i explained to him yes, it is silent with nothing except for the OS is running, but the second you open any applications, the fans jump to 2k, then to 3k and eventually to 4. his response: word and safari are VERY resource intensive, people are surprised how resource intensive they are. needless to say i was upset, especially since my 2500 laptop never sounded like a small cessna about to take off.
next, i showed him that the logic board didnt fix the black spot i had on my 4 month old sreen, as the previous tech said it would. his response: these glossy screens damage easily when you close them, its normal wear and tear. thats good to know, buy a $2,499 laptop, screen can damage within 4 months due to "closing it", who would have thought anyone would attempt to close a crazy laptop. sounds like 1) breach of warranty, express and implied and 2) breach of fitness of merchantability.
i love apple, but im disappointed. what am i supposed to do now? he said he would sent it off to the depo, but it takes a week and implied that since their hardware tests didnt show any problems, the depos wouldn't either.

Mac Mini - Flashing Folder Icon / No boot / Loud fans

I recently got my Mac Mini back after 8 months of it being 'elsewhere' (someone had it, tried to gain access, failed because I have filevault).
When I first got it back yesterday I turned it on, booted and then logged in, noticed no sound, and system was saying there was no sound card. The computer wasn't lagging or freezing whatsoever, so I reset it and still no sound.
I open it up and what do you know, someones opened it (I assume to get to the HDD) and had unclipped the sound card ribbon. Reseated that and put it back together, turn it on and finally a chime, but then nothing, White screen, and fans turn on full blast. I reset it, same thing. Reset it about 10 times, only thing I noticed was half the time my mouse cursor would show and let me move the cursor around.
So I take it apart again, check all connections, restart, same symptoms.
Pull it apart again and try installing 1 RAM chip at a time, same symptoms.
I tried booting it with resetting PRAM, NVRAM, I tried starting holding option, pressing c, everything, and nothing happens! Same symptoms. I tried holding down power for 10 seconds, hear a long beep, then chime, same symptoms!
So I take it apart again, take out hard drive, check connections (all ok), put it back in, same symptoms.
Anyway I got angry so i turned it on and left it doing it's White screen business. Come back 45 minutes later, flashing folder icon with '?'
I reboot, wait 15 again, same folder icon, loud fan, nothing else.
This doesn't make sense, HDD was fine 5 minutes before, no noises at all, no lag, no errors. I didn't touch the hard drive previously to the problem, and now nothing is helping. I've had the hard drive replaced 2 years ago due to near failure, but saved all data by cloning the disk, the HDD isn't old!
I just bought an external HDD enclosure, should arrive soon, and a new HDD, issue is this disk is filevaulted, I'm scared my data is going to be lost for good.
What can I do? I've lost my OS X disc, but judging by the computer being unresponsive to other commands at boot I doubt it would boot a CD anyway.
Please help.
Thanks

Whew, what a bad ride.
Does it also have Firmware password protection in Mac OS X ...
http://support.apple.com/kb/HT1352
It would block usage of all the startup keys, like C, N, T, D, CMD+s, CMD+Option+p+r, CMD +v, Option, and Shift, as well as booting from anything but the Hard Drive.
Force Removing Password Protection
1) Add or remove DIMMs to change the total amount of RAM in the computer.
2) Then, the PRAM must be reset 3 times. (Command + Option + P + R).
http://www.securemac.com/openfirmwarepasswordprotection.php
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214

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/

New Loud Fan issue

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