Fans running full blast and CPU

Hi,
I have a late 2003, early 2004 dual 2.0 ghz G5,1 gig ram running OS x 10.4.7. Everything has been fine up until a few weeks ago the fans started running at full speed when the system was on, no variation, just full speed. I ran the hardware test disc and I get the following error, 28 seconds into the test,----2SAM/1/3:CPU B AD 7417 AD4 post/2176/0---
I have talked to a service centre close by and they have told me that the CPU is bad and needs replacemwnt to correct the fan problem. Everything runs normally as it used to, sleep, wake, all function fine. Do I need a new CPU or is their something else causing the problem??

Hi DS,
Thank you for your quick reply and insight.
I do not have the full version of Hardware Monitor as of yet, just ordered it tonight so will have it very soon and then will be able to have full info. The demo version gives me the following info.
1) CPU A die temp--28.8 degrees celsius
2) CPU B Die Temp--29.1 degrees "
3) Drive Bay-------24.0 degrees "
4) Main Logic Board air inlet---24.0 degrees "
5) Main Logic Board ambient--27.6 degrees "
6) Main logic board backside--27.0 degrees "
7) Memory controller heatsink--31.8 degrees "
8) Processor Card A Ambient---26.5 degrees "
9) Processor Card B Ambient---26.0 Degrees "
10) Smart Disc Temp----26.0 degrees"
This is after the system has been running for the better part of an hour with the room temp. at 65 degrees Fahenheight. Programs running at the same time that these temperatures where taken are as follows-- Quark express, Garage Band, Aperature, MS word, Illustrator 10,Firefox, Filemaker Pro. With all those programs running activity monitor for CPU reads as follows--
% user--3.5
% system--2.0
% nice--O
% idle---94.5
System memory shows as having 330 mb free at the same time
Fan speed is a constant " turbo" sound, no variation in speed or sound, very loud.
It would seem that as you have suggested that I am getting a false reading from the Apple Hardware test as all readings seem to OK.What do you suggest that I try to do to bring the fan speed down to a normal level? It would seem that the dual CPU's are OK and that something else is causing the problem?? Would you agree? Appreciate any help that you can suggest.
Thanks Much
Machine is a 2.0 ghz ,dual processor G5, I gig memory, ATI video, model #-M9032ll/A, late 2003, early 2004 production.

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Sleeping G5 often makes fans run full blast and machine unresponsive

the only thing new lately is that I installed Leopard 10.5.3 on my dual 2.0 GHz G5 tower.
I usually sleep my machine all the time
now it's a crapshoot whenever I sleep it whether or not it will go to sleep normally, or freeze in a state of screenless unresponsiveness with the fans running on full blast with no way to stop except a hard shut down or power kill
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I believe I have solved this problem for now.
I opened up my G5 and used compressed air to blow out all the months of dust buildup in the machine.
I re-seated every single removable component inside (RAM, PCI cards, graphics card, etc)
I also pushed the PMU reset button once and then put the machine back together.
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A few days later, the machine hung up after being put to sleep AGAIN with the fans kicking up and the light on my cinema display staying one dim level without the "snoring."
This time I disconnected my Belkin USB hub and I have not seen the problem resurface since.
The interesting thing is that cleaning out the machine and resetting the PMU sure seemed to help.
So maybe it was a combination of things that were the culprits.
I also wonder if I can ever use this perfectly good and only 1 year old Belkin USB 2.0 hub ever again.
My father uses the same model on 10.5.4 as well on his MacPro without any problems. I am on a G5.
I wonder if there's a firmware on the Belkin USB hub that could be in need of upgrading or if I simply cannot use this hub w/ this computer anymore.
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I will report back if the problem happens again, but for now, since the computer has been sleeping totally fine for days now since removing the USB hub, I am marking this question as answered and hope that this info can help other people.
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Random Overheating/Fans Running Full Blast

Hi there,
Ever since I received my Early 2008 Mac Pro a couple of months ago, it would randomly begin blowing the fans at full blast and continue to do so no matter which OS I boot to, Mac OS X, Windows, or even Linux discs. iStat Pro reads that my Northbridge is running at 249º F, which is completely ridiculous, since all of the internal components to the machine are running very cool. This Northbridge sensor is appearing to throw the fans into overdrive. It sounds like I'm working next to a vacuum cleaner. It's very loud and irritating to work next to.
Unfortunately for me, I don't live near an Apple store, or have the means to get to one. Apple also will not let me send in my machine. About a month ago I had the chance to drop my machine off at an Apple store, but the geniuses were very confused about the problem. 2 Weeks later I received a phone call explaining that my problem was fixed. They never explained to me how the problem was fixed. I had a friend drive out to the Apple store and pick up my machine for me, but when I turned it back on, it still ran full blast. Nothing was different.
I came back from work one day and to my surprise the machine was completely silent. It has been randomly going from full blast fan speed to normal fan speed ever since, fixing itself every few days. I have 0% CPU usage at all times, yet the machine thinks it's overheating.
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Reset PRAM
Reinstalled Mac OS X
Unplugged the computer for days on end
Swapped Hard Drives
Taken RAM out
Tried SMCFanControl
Taken out that little CR2032 battery on the mainboard
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Yesterday I popped in my disc and did an Apple Hardware Test. It passed with flying colors after hanging up and appearing frozen for 10 minutes. Found that little button behind riser A and pushed it for 5 seconds, rebooted a few times, unfortunately it did not work.
Also where is the Apple Hardware Monitor? Are you sure you don't mean Activity monitor? I couldn't find where the temperature/fan readings are in Activity Monitor.
The fans turned off, however, today when my computer woke up from sleep mode. They were off for about ten minutes when all of a sudden the fans kicked on full blast. This was strange because the computer would usually gradually increase over a 15 second period... not immediately. So now it's still stuck here, making noise :\

2.3 G5 Crashes and Fans Running Full Blast

My work horse G5 dual 2.3 crashed today and the fans were running full blast.
I did some research and have:
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Thanks for the reply and link, japamac. That thread didn't pop up in my search.
After following your link, I ran the Apple Hardware Test. The detailed test took right at an hour and a half (three times longer than it said) and returned no problems.
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It could be the device itself. Is it covered by the warranty?
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Fans running full blast.

Alright.. I was plugged into the wall with my MBP and I flipped my computer over to take out the battery to check the serial for the battery exchange thing. Then i flipped it back over and knocked off the magsafe connector off. So obviously, my computer shut off. I wasn't doing anything important, no biggie. But since it started up, my fans are running on full blast and I've never ever been able to hear my fans ever running before now.. Any ideas?

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I have gone through the forums and haven't found an answer to this one. I have an Intel Mac Mini running the latest updated Tiger that I use solely for a media center.
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Hi Big_Mike_180,
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Hi, I read several posts about fans but do not have any crash or freeze issues associated with the fans in my G5 server constantly running on high... Fans are on full blast for two days now, no software updates or hardware changes have been made to the server
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A fan issue is usually related to the SMU. I see that you tried that, but if you used the +push the button on the motherboard+ method, try the +unplug the power cord+ method as described here
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My MacBook Air 13' (2013) will occasionally start the fan at full blast, not connect to any wifi or detect any wifi, and will remove the battery icon from my menu bad as well as tell me there is no battery connected. How do I fix this?

My MacBook Air 13' (2013) will occasionally start the fan at full blast, not connect to any wifi or detect any wifi, and will remove the battery icon from my menu bad as well as tell me there is no battery connected. How do I fix this? I have restarted my computer multiple times, **** it down, and ran a diagnostic test to tell me nothing is wrong and my computer is not running any applications. There is no reason for the fan to be on full blast! when I try to set the option to show my battery icon in the menu bar, it will automatically uncheck. How do I fix all of this?

Have you tried SMC and PRAM resets?
http://support.apple.com/kb/HT3964
http://support.apple.com/kb/ht1379
Ciao.

CPU fan running full speed after 15 minutes

My 3 month old iMac 24" has just started having fan problems.
Before I went away on a training course, it was working fine. Left it switched off at the outlet for 3 days, now the CPU fan runs full speed after the iMac has been switched on for 15 to 20 minutes.
CPU temp is 24C, CPU heatsink is 28C. Ambient is 17C. CPU fan is 3600rpm. Other fans are normal.
CPU usage is less that 10%. Only Safari is running.
I've tried resetting the SMC - left all plugs disconnected for 15 minutes, reconnected mains power for 15 minutes, reconnected USB, then switched on.
Still the same - OK for 15 minutes, then CPU fan runs full speed.
Anything else that I can try?

I tried again, following your instructions exactly. It seemed to work, running normally for about an hour.
I left all the USB devices unplugged, except for the keyboard and mouse.
I then shut the iMac down, but left the mains power turned on at the wall. When I switched it on again 2 hours later, all was OK for 15 minutes, then the CPU fan ran at full speed.
Shutting down for a few seconds fixes it for another 15 minutes.
I'm wondering if it's a software problem, although I haven't loaded any apps recently, apart from a few monitoring programs since this problem appeared.
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Athough there is not much usages in the CPU , but the Fan runs really hard and loud , and i've ready try to reset the SMC ! i don't know what to do !

Athough there is not much usages in the CPU , but the Fan runs really hard and loud , and i've ready try to reset the SMC ! i don't know what to do and i'm very worried.

Nguyen Phuc wrote:
Athough there is not much usages in the CPU , but the Fan runs really hard and loud , and i've ready try to reset the SMC ! i don't know what to do and i'm very worried.
I suspect you didn't reset it right.
Turn off the machine, let it charge up and then try the SMC reset again.
https://support.apple.com/kb/HT3964
Run a Hardware Test
https://support.apple.com/kb/ht1509

Can't wake up my iMac in the morning and fans going full blast

Several times in the morning, after leaving my iMac on all night, I've found the machine asleep and the fans going full blast !?!
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I then had to turn the iMac off manually and restart. I had a failed power supply replaced in April and am covered under the Apple care program (thank goodness !!!).
Could this be the logic board overheating now ?
Thanks for your help- Jim Vaughn

Hello Jm - it could well be another thermal problem, take a look at your Console logs and see if anything jumps out at you.
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I have a need to update my OS. Should I go slowly and move to Lion (10.7) or go full blast and update to Yosemite (10.10)?

I have a need to update my OS from 10.6.8. Should I go slowly and move to Lion (10.7) or go full blast and update to Yosemite (10.10)?

Before embarking on a major OS upgrade, it would be wise, advisable and very prudent if you backup your current system to an external connected and Mac formatted Flash drive OR externally connected USB, Thunderbolt or FireWire 800, Mac formatted hard drive. Then, use either OS X Time Machine app to backup your entire system to the external drive OR purchase, install and use a data cloning app, like CarbonCopyCloner or SuperDuper, to make an exact and bootable copy (clone) of your entire Mac's internal hard drive. This step is really needed in case something goes wrong with the install of the new OS or you simply do not like the new OS, you have a very easy way/procedure to return your Mac to its former working state.
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OS X 10.7 Lion system requirements
Purchased emailed download code here.
http://store.apple.com/us/product/D6106Z/A/os-x-lion
To use OS X 10.7 Lion, make sure your computer has the following:
An Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
Mac OS X v10.6.6 or later to install via the Mac App Store (v10.6.8 recommended)
7 GB of available disk space
2 GB of RAM
To install OS X 10.8 Mountain Lion, 10.9 Mavericks (free upgrade, but currently unavailable) or OS X 10.10 Yosemite (currently available free upgrade) you need one of these Macs:
OS X 10.8 Mountain Lion purchased emailed download code here.
http://store.apple.com/us/product/D6377Z/A/os-x-mountain-lion
iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later),
MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
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2 GB or more of memory (I strongly advise, at least, 4 GBs of RAM or more)
8 GB or more of available space
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http://roaringapps.com/
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Fans running full blast and CPU

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