Running fan, disk0s3 I/Oerror

Fan on this quad G5 suddenly started running at full speed. I've found lots of suggestions to troubleshoot, one of which was to reset PRAM. But the computer won't should down so I forced it to shut down by holding the power button and then reset pram 3 times and booted in single user mode, then ran fschk. It gave me this error: disk0s3 i/o error. Also said bad catalogue B-tree that it could not repair. I plan to try DiskWarrior but would like to know what the disk0s3 error means and can't find any documents here on that. Anyone know or have other suggestions.

I am wondering what is the relationship between the fan and the likely data corruption on the hard drive?
A bit of an Egg & Chicken question as to what came first!
I gather that the OS must read the temperature and send instructions to the fan rather than just a built in switch that operates independently of the OS. Thus corrupt data in the OS can cause the fan to malfunction. True?
Correct, if the OS crashes or can't boot & read the sensors, then for safety the Fans go full bore.
Crossing my fingers that DW fixes the problem!
IMHO, it's the best we have.
BTW, you might enjoy this DiskWarrior review/recommendation...
http://discussions.apple.com/thread.jspa?messageID=9645801&#9645801

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My mac pro suddenly turned off by itself, then after 10 minutes it started to work again with "no battery available" icon and an always-running fan!

My mac pro suddenly turned off by itself, then after 10 minutes it started to work again with "no battery available" icon and an always-running fan!
it's bugging me since I don't know if it's recharging or not..

Mine has just done this too. Did you find out what it was?

High CPU usage and continuously running fan

I recently sent off a logicboard to be repaired for a non-charging issue. Everything worked fine with the exception of the battery would not charge. I received the board back today and noticed immediately that the fan starts running at high speed within 10 seconds of pushing the power button. It also boots extremely slow and when it does finally, eveything takes forever to open. It seems to operate better in safe mode but the fan is still running at about 6200 rpm. Using iStat, I noticed that the temperature itself is not that bad. The CPU is running at about 32 C. And it doesn't feel hot to the touch at all. But the fan never shuts off. I have tried an SMC reset and PRAM reset, no joy. I tried a new hard drive, still no joy. When I can finally get into Activity Monitor, it says that Kernel_task is using upwards of 200% of the CPU. Any suggestions on what I can try to get this kernel_task issue corrected and get the fan to slow back down? Thanks in advance for any light anyone can shed on this.
Macbook Pro 2010 13 inch
Tami

I was able to run the Apple Hardware Test and the error is:
4SNS/1/C0000008: TsOP- - 124
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HT201295 Late 2009 Intel iMac Needs Frequent SMC reset - constant high speed running fan

Late 2009 Intel iMac is having reoccurring episodes of high speed fan running, especially after waking it up. The SMC reset by unplug and reboot works, but I worry that this is a serious sign and that the machine is slowly dying. Any thoughts? Works fine otherwise.

wolfgang272 wrote:
Do you have any ideas?
Yes, you just need to reset the SMC and you should be fine
https://support.apple.com/kb/HT3964
Whoops you already did that.
Hardware Test then
https://support.apple.com/kb/ht1509
Read more info here
https://discussions.apple.com/message/16276201#16276201

Kernel_task, running fan, Chrome CPU problems

2011 Macbook Air here. Kernel_task always uses a huge amount of memory, and the fan is often running. Also, Chrome is constantly dominating my CPU. What can I do?

2011 Macbook Air here. Kernel_task always uses a huge amount of memory, and the fan is often running. Also, Chrome is constantly dominating my CPU. What can I do?

Dual 2ghz G5 Panther runs fans on High constantly.

Regarding the G5 fan issues in Panther.
To recap, I have a Dual 2 ghz system with PCI, 4 gigs max ram and a Radeon 9600 128mb. After unwrapping my G5 fresh from Apple's refurb lab I set it up and found that my Tiger partition seems to run fine, but the Panther partition, 10.3.3, runs the system fans on full blast. I would like to keep a mirror of my G4's 10.3.3 on the G5 until I sort out a bunch of things. The fact that this model G5 is supposed to support Panther is why I bought the refurb and not a new model.
I basically wanted a G5 that mirrored my current system, but faster. So anyway, I knew that the hardware worked because Tiger worked, so I upgraded the OS to 10.3.9 and the fans were fine. So the fix is a software issue. But do I need to jump to 10.3.9 to achieve it? Can I install a more specific software to address this issue?....Lets see...
I made another partition after a fresh cloning and using my 10.3.3 partition I installed just the extensions from the 10.3.9 combo update using Pacifist. This solved the fan problem. Granted, it whacked out the firewire which stopped recognizing my external drive, but I was just checking to see if the fix was in there separately somewhere... and it was. My only fear was that the fans were now not going to ramp up when it was warranted. What the **** do I know, but I think this proves, or at least suggests pretty strongly that the fan issue can be solved with an individual update. All I need to know is which elements from the 10.3.9, or even an earlier update, are needed to reliably solve the fan issue without hurting the system in some other way. I don't want to do anything to jinx the system so I'm returning it to it's normal state and then upgrading one level of the whole OS at a time to see where the fan fix kicks in. I've already tried 10.3.4 and that doesn't work. 10.3.5 is next. After I find the first OS upgrade that fixes the fan I will check all my software and see if I can live with it until everything is Tiger compatible... unless someone answers this question for me and then Panther is back to 10.3.3 with the fans fixed. As it should be. The only reason I'm obsessed with it is that the OS and my programs work fine, but the fan is driving me nuts...and I'm worried that letting it crank away on full blast like that would eventually wear them down. Any ideas? Would love to hear from someone at tech support? Thanks....

I think the G5 DP2 you have, with 4 RAM slots & PCI, is known as an 'Early 2005'.
From this list
http://docs.info.apple.com/article.html?artnum=25517
the build of OS X supplied with it was at least 10.4
Apple do not support running an earlier version of OS X than the build it shipped with
http://docs.info.apple.com/article.html?artnum=25497
Sometimes an earlier version works ok, often after an install from a "retail" copy of 10.3 - system discs from other Macs may have system-specific features.
This was discussed at great length when the G5s supplied with 10.4 were released. If you search on "10.3" last year, no doubt some of it is still around.
You could also try browsing/searching/posting in the 10.3 forums
http://discussions.apple.com/category.jspa?categoryID=161
Otherwise, I guess it's a case of trial and error.
Using the "combo" updaters may help alleviate some problems. No doubt you are repairing permissions, disconnecting peripherals (esp. firewire), etc, etc. Good Luck.

Running fan, and kernel 350% CPU

Hello,
I'm not very tech savy but I will try to describe my problem as best as I can!
I use a 2011 Macbook Pro (version 10.6.8, processor 2.3 GHz Intel core i5). Lately the fan has been running nonstop, and everything runs very slow and glitchy. I checked the Activity Monitor and saw that kernel_task is using over 350% CPU at all times. Any solutions to get my poor MacBook to run normally again?

Get a backup drive you can use. Partition and format it for use with OS X. Download Carbon Copy Cloner and use it to backup your entire /Home/ folder. This will protect your files so you can erase and reinstall OS X.
Clean Install of Snow Leopard
     1. Boot the computer using the Snow Leopard Installer Disc. Insert the disc into the
         optical drive and restart the computer. After the chime press and hold down the
         "C" key. Release the key when you see a small spinning gear appear below the
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     2. After the installer loads select your language and click on the Continue
         button. When the menu bar appears select Disk Utility from the Utilities menu.
         After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, set the format type to Mac
         OS Extended (Journaled, if supported), then click on the Partition button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
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HD fan running, Fan temp 97˚F - ?normal

I have a 20.5 imac with fan noise.
Two of the fans run around 1450 rpms.
The hard drive fan runs at 5150 rpms despite the hard drive temp being the lowest of the sensors running 97 F.
The hardware test on the shorter test shows no abnormalities. Resetting the SMU did not change the fan noise.
Any thoughts? This is supposed to be a quite Mac. It is the noisiest by far.
Lewis

Here are my 27" i7 stats for comparison (temps in Fahrenheit), taken from iStat Pro:
Optical drive fan: 998 rpm
Hard drive fan: 1099
CPU fan: 940
HD: 103 degrees
CPU: 92
Ambient: 65
GPU Diode: 117
GPU Heatsink: 113
Mem Controller: 99
Optical Drive: 92
Power Supply 2: 112
Under most conditions, those are typical readings for my machine. When doing video encoding, on the other hand, the CPU has reached 155 F, the power supply goes to 140 or 150, and all three fans spin at >1200 rpm. Things go back to normal pretty quickly, though, once the encoding ends. Yeah, I know I don't have the same machine as you but you asked for some benchmarks...
One more thought: do you have pets or is your computer in a dusty location? You might want to try cleaning all the external air vents, if you haven't already done so.
Message was edited by: inandoutofgrace

Constantly Running Fan

I have a 2 GHz Macbook, with 1 GB of RAM and an 80 GB hard drive, for the past couple of days, the fan has been running loudly pretty constantly. I downloaded iStat and the RPM has been consistently above 5100 or so. This is always happening, regardless of what program I'm running, which has mainly been Safari. Any suggestions?
Thanks,
Matt

Hi ionizingandatomizing: Sounds like a runaway activity. Go to Applications > Utilities > Activity Monitor. Sort by CPU, making sure that "all processes" is selected at the top of the dialog box. Check if there is an activity/process using a large amount of CPU. Print Jobs seem to be a common culprit
Good Luck
Stedman

Portege M400 - always running fan at 100%

I was excited to receive my new toshiba portege m400 today, but the fan noise is quite bad.
The problem is that it always runs 100% -- I tried the Toshiba power save properties to
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Worst of all, the cpu temperature is very cool, just 29 degrees, and there is no need
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-- Daan.
ps. bios version 1.30, toshiba power save tools 7.08.00. Cpu speed is dynamic, usually at 1 ghz and
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[Edited by: admin on 20-Apr-06 06:48]

Hi all,
thanks for the suggestions. However, my cooling unit is brand new and doesn't have dust in it, and the antivirus package does not take cpu time: on the contrary, at the moment, I use about 1% of my cpus, the temperature of the cpu is 28 degree celcius (which is extremely low), and the fan just happily blows lots of cold air out of my machine. I think just feeling that the air coming out is *cold* is the best sign that the fan just blows too much.
I have the latest bios, the latest drivers, set the cooling method to "battery optimized" and nothing helps -- it makes more noise than my other workstation. What should I do? Are there any technical engineers around at Toshiba that look into the fan wiring/temperature sensor?

Running Fans AGAIN question

Hello to all
My MBP fans run on and off (normal I know) EXCEPT they at times run while NOTHING is happening, the computer is idling, no software is running, and its not hooked to the internet, no ambient heat, so what gives? Should I be concerned?
Your input and expertise would definitely be appreciated.
Thank you
R.

If by 'all is off' you mean you have no active applications, that doesn't mean everything is off. Dashboard widgets, menu bar items, and system processes may still be running. Spotlight may be indexing a hard drive. Lots of possibilities.
Check Utilities > Activity Monitor > CPU tab, set the pop-up menu to Active Processes (or All Processes, but not My Processes since that won't show everything), click on the CPU column to sort, and see if anything is using a high amount of CPU capacity.

IBook G4 won't boot - runs fan - show's ghost?

I've had my iBook G4 (14 LCD) for a while now. the LCD originally broke, but i replaced it and had it running for about 2 more years.
I went on a trip to the coast, and everything's been fine with the quirky little iBook - the battery still dies within 10 minutes of unplugging, the charger is touchy as ****, and so on. However, one day, after another brutal Seahawks defeat, i came back and noticed my fan was running wild and the computer almost seemed asleep (much like most people on here have described). after waiting for it to wake up, i finally did a hard reboot, but when i went to turn the computer back on, it actually gave me a few different scenarios:
1.) (the most common). I'll push that little power button, the fan will instantly kick itself into high gear, and i'll see a pretty black screen, maybe a white 1px bar across the top. within a few seconds, this ghostly white-to-purple mist goes across the screen, and actually, when it makes it into the middle, it shows that glorious apple logo, and the loading image on the bottom - but it never goes anywhere. it eventually goes away to a full black screen with a crazy fan blowing, and nothing happening.
2.) (randomly) i'll push the power button, and low and behold, it'll actually get to the login screen. now, seldomly it'll let me login, but it usually freezes at some point, making the same fan noises, and actually scrambling the pixels to some unrecognizable mess over my desktop/login screen.
I've tried the resets, i've tried booting from disk, i've tried letting it be for a month or so, but to no avail, the problem persists. i've scoured the forums, but nothing quite matches up with my set of problems, so hopefully someone can help me out!

Hey Travis,
the battery still dies within 10 minutes of unplugging
Needs a new battery. Check - about this mac - more info - power - battery and look at the capacity and cycle number
the charger is touchy as **,
Needs a new charger, cord or DC in board.
noticed my fan was running wild .. the fan will instantly kick itself into high gear
That could be U28:
http://www.coreyarnold.org/ibook/
The shim will fix it temporarily. A resolder of that chip would be permanent.
and i'll see a pretty black screen, maybe a white 1px bar across the top. within a few seconds, this ghostly white-to-purple mist goes across the screen, and actually, when it makes it into the middle, it shows that glorious apple logo, and the loading image on the bottom - but it never goes anywhere. it eventually goes away to a full black screen with a crazy fan blowing, and nothing happening.... it'll actually get to the login screen. now, seldomly it'll let me login..freezes at some point, making the same fan noises, and actually scrambling the pixels to some unrecognizable mess over my desktop/login screen.
That is the classic description of the GPU BGA problem. Here's a recovery from this problem:
http://discussions.apple.com/thread.jspa?threadID=1772152&tstart=0
Richard

Constant running fan

I just installed the latest OS X 10.8.1 patch and now my fan will not stop running? Why? ...and how do I fix this?

Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Intel-based Macs: Resetting the System Management Controller (SMC)...
http://support.apple.com/kb/HT3964

MSI B75A-G43 runs fans at full speed for 1-2 seconds after powering on the PC

Hello fellow MSI owners,
I have a MSI B75A-G43 board and i was really curious why does the fans run at full speed for 1-2 seconds when the PC gets powered on and then gradually quiet down to normal speed. Other than this, the board works great. I have had only boards from Gigabyte previously and they do not exhibit this behavior, is this a MSI thing ?
Thanks,
Alex

Thanks for the answers fellas !
Indeed it looks like normal operation on the MSI boards ( may differ on the latest Bios versions maybe). PWM control probably works differently on the Gigabyte ones

Screen dark & running fan, but I already tried resetting the PMU

Okay, my screen won't turn on. When I hit the power button of my iBook, I can hear the computer spool up and the fan comes on at high power.
When I try to reset the computer's PMU, nothing happens.
Here's what I'm doing, and the result:
1) Starting with the computer off.
2) Pushing COMMAND + OPTION + POWER BUTTON all at the same time.
3) Nothing happens.
4) I wait 5 seconds.
5) I push just the POWER BUTTON.
6) The screen remains dark and the fan turns on at high power.
Am I doing something wrong? Is there something else I can try?

Hi,
Try this site. Your symptoms sound like what Corey's talking about:
http://www.coreyarnold.org/ibook/
Post back.
Richard

Running fan, disk0s3 I/Oerror

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