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
other than this the machine is literally working just fine. Never interferes with my work.
I don't know if this is 10.5.3 related or not, but I do wonder.
I started up from an applecare disc and did a full diagnostic and everything checked out
I guess I'll have to test Tiger sometime again but that'll be a pain because I'm already addicted to Leopard
I just hope this old faithful tower isn't going dead on me. and I wish there was some official word if this was just a 10.5 thingy

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.
I proceeded to sleep it and wake it up about 5 times in a row, and it didn't exhibit the blowing fans problem and the light was "snoring" as it normally should in sleep mode.
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.
(luckily I don't need it urgently right now)
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.
If anyone has anything to add to this thread or knows about the specifics I've discussed above, please feel free to respond more.
Thank you

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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.

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.
So now I ask you, Apple Discussions Board members, what can I do to resolve this annoyance? I have:
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
And no luck. Help is appreciated!

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 :\

GeForce 8800 GT Fan running full blast

Hey there folks,
I have a Mac Pro (early 2008, MacPro 3,1) with the OEM Nvidia GeForce 8800 GT graphics card.
Last night when I got home from work I booted up the machine and the fan on the 8800 came on full blast, it has always done this for 3-4 seconds on boot and would then spin down again. The thing is this time it never spun down, it kept going full blast and has ever since. The card is not under heavy load and is cool to the touch. The fan keeps going full speed so long as the machine is on, regardless of activity. Only when it goes to sleep or is shut down does the fan stop.
I've tried resetting the PRAM, resetting the SMC, and even ran Apple Hardware Test and it returned no errors. I have iStat Menus installed but I don't believe it is capable of showing feedback on the card. I haven't been able to find much online about this issue and there are apparently no Mac versions of Nvidia's control and monitoring software for their cards.
I took it into the local Apple store today and the Genius Bar almost immediately told me its a flat-out replacement issue. The machine is out of coverage so ordering a new copy of the same card is expensive ($380). I've looked into other, newer cards like the ATI 5770 or 5870 through Other World Computing and they seem like good options.
Has anyone else come across this problem or know of a workable solution?

I replaced the card. At first I took it to the Apple Store but the person there said its basically just a somewhat common hardware failure on the card. Not much to do but repair or replace it.
Rather than spend the time and money to have them diagnose it further just to tell me the same thing I replaced it outright with a card from Other World Computing; the ATI Radeon HD 5770. IT was a good alternative for my machine which, due to it's hardware configuration, has only a few to pick from as viable replacements. It's been working fine so far, no complaints. Just be aware it is a BEAST of a card and puts out a lot of heat.

Classic makes fans run full speed

I think this is new. When I run Classic my fans run full speed (10.4.8 G5 iMac 20") with any of the kid's games. I've done the SMU reset, blown dust from vents, tried different power settings. I think blowing out the dust reduced fan use in OS X, but not in classic.
Thermograph data suggests the fans are behaving appropriately, so I think the system is running hotter than in the past. Anyone have other ideas? Anyone else seeing this classic behavior?

Have a look at one post I made some months ago :
http://discussions.apple.com/message.jspa?messageID=1621311#1621311
I discovered that going back to Classic from one user to the other make a large use of CPU (80 to 90%) thus rising the temperature and conversly the fan...
If you open classic in one enironnment that's not true. Check it with Acivity Monitor.
Hope this helps.
JfS

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:
-run Disk Warrior
-reset the PRAM
-reset the SMU
-replaced the 3.6V battery with a $20 battery from Radio Shack.
The system still crashes, leaving the fans running a full speed. Then, I noticed that only 1 CPU is being recognized. :"(
Is there anything I can do to get the other CPU back up/ recognized or is it dead?
Is it feasible to buy a CPU off ebay to replace mine? If so, is it a straight forward operation or very tricky?
Thanks.

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.
I restarted and both CPUs showed up in the Activity Monitor and things were fine for about 20 minutes, then the system simply froze, while I was running Safari and Firefox. But, no loud fans this time.
Upon a hard restart and then a soft restart, I'm back to one CPU.
Since only one CPU is showing up, I don't have a faulty one to deselect (I installed the "Processor" System Preference from the Developer>Extras>PreferancePane) or disable via Terminal.
So, I've got a couple of questions:
1. Where are the error logs that I should look at?
I've opened the Console, but can find no mentions of "panic" or "cpu," other than some 3 year old references under "Java."
2. More importantly, *how do I know +which CPU+ has failed*?
I see no references to "CPU 1" or "B" or "0" or "A." It's as if I've suddenly got a Single 2.3 G5.
3. Any possibility that this is a software issue?
I'm wondering if a recent update of Safari could somehow be a culprit. I had it open and also had Firefox open, both with 10-12 tabs. I know they can be memory and processor hogs.
Anyway, I will reseat the CPUs and grab a serial number while in the process and report back after a while.
Thank you for your help.

Ix4-300 fan keeps running full blast and the NAS never comes online

When I turn on the ix4-300 after a couple of seconds its fan starts running full blast but the NAS never comes online. The NAS lcd was damaged in the move so I don't know what is going on, it was working fine for a couple of weeks (with the damaged lcd) but this started happening a few days ago. Things that I've tried:
Used the other ix4-300 (I've 2) with the faulty NAS... same result
Let the NAS run with full FANS for 4 plus hours ......, Still didn't come online
Also both the blue and white light are constant .... no blinking whatsoever.
Any ideas ...
Solved!
Go to Solution.

It could be the device itself. Is it covered by the warranty?
Are you concerned about retrieving the data or do you just want the device back up and running properly?
If you are not concerned about data, you can try the following procedure at your own risk:
Power down the device and reseat all the drives in the device. Power the device back on.
If this doesn’t allow unit to boot, continue with below process.
   1. Turn off the device and pull out all the drives.
   2. Place any other drive 2, 3 or 4 in the first slot and boot up the device.
   3. Wait for sometime as the boot-up process can be slow.
         a. If it doesn’t boot, try another disk in slot 1.
   4. If it boots up correctly, insert another disk in slot 2.
        - Check UI for disk detection.
        a. If second disk is detected, turn it off, place disk 3 and 4 in unit and boot up.
        b. If it doesn’t boot-up correctly, remove 3 or 4 and retry. You may need to try to determine if 3 or 4 is bad in this case.
   5. Recreate the volume if it doesn’t start regenerating automatically
Have questions and need answers?
Search the database for answers to FAQ's, software/driver downloads, tutorials, news, features and more!
LenovoEMC Support & Downloads
LenovoEMC North America Support Contact Page

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?

My first thought is that one of the two thermal sensors came unplugged with it being upside down/jerked; if so then it needs opening up and reconnecting by Apple. It shouldn't do this so warranty kicks in.
It might be worth resetting the power manger first though?
http://docs.info.apple.com/article.html?artnum=303319

Intel Mac Mini fans run full blast even when off

Hi All,
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.
About a week ago, the box started running fans full blast, regardless of whether it was actually turned on or not. As soon as it is plugged in the fans blast.
Otherwise, it seems healthy, and boots normally.
The steps I have taken so far include resetting permissions, verifying the disk, and resetting the SMC in the proscribed fashion.
After this occurred, I downloaded and installed smcFanControl from Lifehacker.com. This reported fan speed of zero and Temperature of zero.
Next I opened the case and insured the fan/HD cable next to the lttle battery was securely fastened as this had been reported to cause this symptom.
What's next? The device is out of warranty and honestly, I don't want to spend any money if I can help it.
Should I take it apart further and see if the other end of the fan/HD cable has somehow worked loose?
Can anyone think of another cause besides a loose cable?
What if I completely disabled the fan? The hardest thing I ever ask it to do is run iTunes and VLC.
Any advice is greatly appreciated.
Dave

I have refurbished two G5s with LCS and screaming fans (this was avery common problem with G5 LCS macs), the red light on the motherboard could mean the CPUs need to be re-seated. This red LED light appeared on my mac after I had removed the CPUs to add new thermal paste.
If you have done all the necessary basics with no sucess here are a few things to try next.
1 - Coolant
As BDAqua mentioned above, coolant evaporates and often leaks at the 'O' rings, to check this you will need to remove the CPUs from the LCS and check for crystalisation (white rice). If you have leakage, it will be time to drain the block, add new coolant and 'O' rings. This is tricky to do but there is lots of info here and on other sites to help you.
2 - Thermal paste
Replace the thermal paste with Artic MX4.
Try the above and let is know how ou get on.

Powermac G5 Fans Running Full Blast

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
Other than the Fans running the computer is working fine
Here is what I have tried so far;
• shut down and unplugged power cord for a few minutes
• disconnected Ext FW drives
• cleaned out dust from inside case (very little)
• checked fan connection (dual fans)
• reset SMU
• tech tool pro test
None of the above has had any effect. The only thing that will shut the fans down is putting the server to sleep. Sleeping the computer knocks everyone off the server so that is not an option -
Any ideas would be appreciated
Thanks

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
http://support.apple.com/kb/HT1436
under +Power Mac G5 (Late 2004)+. As stated, "wait two minutes." It does not say "at least" two minutes or "about" two minutes.

HP Pavilion a6110n Startup Problems, Fan Runs Full Tilt and then Shuts Down

We are currently running into an issue where our computer, when we try to power it on, turns on briefly with the fan running at full tilt. After a few seconds, the computer then shuts down and everything turns off. When the monitor is connected, we never do see anything show up there. We opened up the case and cleaned out the fan and the cooling unit completely, and then we even completely removed and then reconnected the unit. Still, the computer continues to do the same thing. Does this sound like a bad sensor? Like the computer thinks it is overheating and just shuts itself down?
Thanks for any help. We tried some of the advice we found on here, like stated above, and seem to have run out of options.

Hi Big_Mike_180,
It is the same for the desktop or notebook. The one blink means that you are having an issue with the CPU, unfortunately. At this point if you are in warranty give HP Total Care a call at 1-800-474-6836 in North America or visit the link below if you are outside North America.
http://www8.hp.com/us/en/contact-hp/ww-contact-us.html
Or take it to a local tech to check the CPU.
Thank you,
Please click “Accept as Solution ” if you feel my post solved your issue.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Thank you,
BHK6
I work on behalf of HP

Fans blowing full blast during sleep

My MacBook Pro (15", 1.83GHz) will turn its fan on +full blast+ whenever it sleeps. This happens immediately, and regardless of whether the lid is closed or not. The computer goes to sleep fine from the Apple menu, and the indicator light pulses (i.e., I think it is really asleep). I've let it go all night long, and the fan never seems to stop. I can get good temperature readings from all the sensors, and the RPMs on both fans look reasonable while the computer is awake. They also modulate in a normal range during use. I haven't had any other trouble with it.
Originally, this computer was salvaged. It wouldn't turn on or charge. I replaced the left I/O board (containing the DC board), and it works fine now. I can't think of what would be causing this, but I'm open to consider that I didn't plug something in correctly as I was reassembling the laptop. I also don't know what caused the original failure of the left I/O board... so I'm not ruling out weird water damage or something.
Any ideas are appreciated. Thanks.

Hi Bill. It is worth bearing in mind that the "default" on most Macs if the OS thermal control routines can't be accessed, or if data from a sensor is not available, for example, is to send the fans up to maximum revs.
Usually when people experience the "full fans during sleep" situation it is because the system is actually "crashing" when sleep is attempted. In such situations , of course, the computer fails to actually "wake up" when asked to and has to be force shutdown! I gather this isn't the case with yours? It wakes up normally and the fans return to normal speed when it wakes?
If the OS isn't loaded (or isn't getting the right readings) , of course, the fans go into hyperdrive anyway (hence the flat out activity when running the Apple Hardware test and the like)
It sounds almost as if the computer is losing effective "Operating System control" and going into "hyperfan" mode accordingly when sleep is activated, but not actually crashing, and then recovering control on waking.
I presume you have tried things like wiping the drive and re-installing the OS from scratch and a PRAM reset as well as the SMC reset already mentioned?
Cheers
Rod

Spinning beach ball of death after crash with fans running full speed

I recently put my machine to sleep - came in the next morning to find it running all fans at full speed and frozen. Did a hard reset (power button in for 5 seconds waited 15 secs and then power on. It rebooted after a long re-boot period. Since then it has slowed down. Many apps take an age to open. Many freeze and there is the infamous SBoD. I have rebuilt permissions, installed 10.5.8 combo, done a permission repair from a separate firewire disk, run onyx - which at time never ends and has to be aborted. Activity monitor shows no exceptional activity when the SBoD is running. I had significant issues until last December when i did a clean rebuild and installation of leopard and put all essential software in from clean install disks - all in all had a pristine machine which was working perfectly until the week before last when the full fan and freeze crash occurred. I notice that it speeded up after the 10.5.8 combo install and permission rebuild from external disk but gradually slows down and gets increasingly unstable requiring forced reboots more and more often. I have no hacks or other background processes other than Virus Barrier 6 which ran perfectly before the crash.

As expected after running well at about 11:40 Mail slowed down and the SBoD started.
The console shows the following:
19/2/10 11:40:00 AM [0x0-0x6d06d].org.mozilla.firefox[4570] Debugger() was called!
19/2/10 11:42:42 AM [0x0-0x6f06f].com.apple.Safari[4671] Debugger() was called!
19/2/10 11:55:22 AM Automator Runner[5082] Error while processing arguments
19/2/10 11:56:47 AM Automator Runner[5130] Error while processing arguments
19/2/10 12:06:08 PM Automator Runner[5420] Error while processing arguments
19/2/10 12:06:54 PM com.apple.launchd[378] (com.apple.Safari[5451]) Check-in of Mach service failed. PID 5451 is not privileged: com.apple.Safari.SyncClient.IsRunning
19/2/10 12:06:54 PM com.apple.launchd[378] (com.apple.Safari[5451]) Exited with exit code: 1
19/2/10 12:07:22 PM Mail[5429] Expected Apple Mail To Do to be selected for Operation "UID STORE", EXECUTING <0x179e47e0>
Dependency: Operation "DONE", DONE <0x17f1c1e0>
Dependency: Operation "IDLE", DONE <0x1843e0b0>
Dependency: Operation "SELECT", DONE <0x17f22ee0>
Mailbox name: Apple Mail To Do
Mailbox name: Apple Mail To Do, had IMAPMailbox INBOX:
EXISTS:32, UIDNEXT:5553, UIDVALIDITY:1226484816 instead
19/2/10 12:12:41 PM Quicksilver[425] * -[NSCFString string]: unrecognized selector sent to instance 0xd4abe0
19/2/10 12:12:41 PM Quicksilver[425] HIToolbox: ignoring exception '* -[NSCFString string]: unrecognized selector sent to instance 0xd4abe0' that raised inside Carbon event dispatch
19/2/10 12:12:41 PM Quicksilver[425] HIToolbox: ignoring exception '* -[NSCFString string]: unrecognized selector sent to instance 0xd4abe0' that raised inside Carbon event dispatch

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.

HT3964 I followed the steps here, but I still cannot get my iMac to stop runnin the fan at full blast. What now?

I followed the steps here to reset the SMC, but I still cannot get my iMac to stop runnin the fan at full blast. What now?

Ensure you are using the SMC reset for an Intel iMac. Sometimes it take several tries back to back for the SMC reset to work. I've included a link to the correct instructions for an Intel iMac (just in case) , click https://discussions.apple.com/docs/DOC-3603.
If you still have issues then run Apple Hardware Test in Extended Mode at least 3x, it's also possible you may have a damaged fan or fan sensor.

Sleeping G5 often makes fans run full blast and machine unresponsive

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