PowerMac G5 Dual 2.7ghz FAN Noise

Hello,
I'm starting to get tired of the fan noise in my Dual 2.7ghz.
It simply goes up and down........like waves.
It spools up then calms down, I don't know what to do: I reset the PMU, NVRAM, cleaned with compressed air(DUSTER) all the fans, heatsink/radiator on CPU's and still the same annoying noise.
I also installed the latest CHUD but then the spooling of the fans was more frequent so I removed it.
It is sad because, the G5 is quiet besides that but becomes unbearable when the fans kick in.
I browse the net.....the start spooling!!!
At the moment I write this the G5 is quiet but if I'll move to another task they'll start the up and down music
Is there something I missed here...Firmware, etc......
Thank you very much.

Flocarino-
Mine does the same thing. Especially when surfing the web. Best thing to do is set processor speed to highest or lowest in the Energy Saver preference panel. It isn't elegant, but lowest is sufficient for web surfing and keeps the fans from ramping. I guess this is the reason that Apple migrated away from the G5 processor.
You do not indicate how much RAM you have, but increasing it to 2MB will help, 3 or 4MB will help even more.
I tried to mask the noise with iTunes, but the latest version is the worst yet at causing the effect.
Luck-
-DaddyPaycheck

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PowerMac G5 Dual 2.0 fan problem

I just bought a Powermac G5 dual 2.0 (June 2004) with 4GB (aftermarket) RAM on eBay that has the 'constant on' fan problem. I have run every series of tests and tricks that I found on the internet and it is still stuck. The machine runs flawlessly, all benchmark tests that I have performed have been completed successfully. In addition, I have done the following:
The door/deflector sensors are working properly, no red LED on the board
I ran all of the OF and OSX ASD 2.5.7 tests on it and they came back clean.
I reset the PRAM, the SMU, PMU and did the NVRAM resets in OF.
I repaired the disk permissions
I reseated the video card
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All temperature sensors are functioning properly, and the Dashboard thermal readouts I downloaded show the temps are well within normal parameters.
I zeroed the HD and installed a fresh copy of OSX10.5
Nothing I have done has affected the problem at all... Does anyone have any suggestions on what else I can try to solve this problem?
Thanks,
Joe

I'm sorry nothing worked. I should have known you would have tried those things. The thing about tiger and fan issues I heard about just a few days ago. You saw which versions were fixed and unfixed though right? Right. Reduced power does nothing too I guess. And turning off sleep. It just doesn't sound like the Jet Sounds that other users have reported regarding their fans and sleep or where the fans go into Panic mode to cool the CPU Temps. Speaking of which I recommend Temperature Monitor to see just what temps you're running at. If they are too high that might be the one explanation.
And one wise Mac forum guru from Japan said something to the effect that most fan issues had something to do with USB problems. I hope he'll chime in, he's very good.
What else... false sensor readings? I have no clue as to where they really are to fix.
I sympathize because I've had fan problems of my own since I bought this mac used about two years ago. Loud revving up and down on Highest power setting... sounds like a demented banshee. Luckily I can just run on reduced power and it keeps the worst at bay.
The Mac I had before this one was a Dual 2.0 like yours. It was a rock solid performer for several years before I put leopard on it. Within a week it was dead as a doornail.
Well I think I've exhausted my ideas on this one. I'll keep thinking about it though. Oh, two more. The first, some kind of cool enclosure that muffles the sound without killing your Mac. The second, and what would be my preferred method if I was rich, would involve a very large hammer and...
Anyway, I really hope you solve this, Joe. If you do, post back and let me know how you did it.
Ack, looking back at your original post I see you already did some of the things above. Sorry, it's late and I'm too tired to edit.
Ok, one last thing I don't think you said but just occurred to me. Have you looked under the cpu cover to see if anything is amiss there?
That's it, I'm spent for now.
Good luck.
Steve

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Hello,
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
Open console in Applications>Utilities, check the system log for the date/time of the last problem & the Startup right after that for clues.

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Thanks
Pete

Robbert,
Thanks for your reply. I decided to try a fix to cool the processor temps and it seems to have worked albeit rather unconventional and honestly after dealing for over a year with an out of control dual 2.7 (my previous computer) until it just self destructed, I really had nothing to lose. I went to Walmart, bought a $15.00 3 speed fan which interestingly is same color as the powermac and is a cylinder type with two exhaust outlets that cover the entire motherboard height. Removed the clear plastic air deflector but covered a piece of paper with aluminum foil and inserted it into the tab slot to fool the computer. Opened CS3, Aperture & Corel paint. Temps quickly went to 137+. Turned on the fan to high and saw temps drop to 120º. Opened several more apps to try to cook the processor but highest temp was 125, Kept running all apps for hours and no shut down. When just running Aperture I turn fan to low. I have not been able to run Aperture for more than a few minutes fro months so this to me is great. I also noticed that when I just removed the air deflector temps went down about 4º. As I said I had nothing to lose and I think it's an accepted fact that a majority of powermacs had/have serious cooling issues. I'm happy.

Which is better for Pro Tools LE-PowerMac G5 Dual-Core 2.3Ghz or Dual 2.7Gh

I'm starting a small recording studio and I own a PowerMac G5 Dual-Core 2.3Ghz with 2GB of RAM and a PowerMac G5 Dual 2.7Ghz with 2GB of RAM. I need to keep one of them to run Pro Tools LE. Both G5's have the same hard drives and similar graphics cards..Does anyone know which would do a better job and if so why ??? Thanks..

Hi popped!
You have posted your inquiry, in the Discussions Forum, that is intended for discourse about the use of Apple Discussions.
You will get more attention to your issue, if you select a more appropriate location from this page Discussions Forum Home.
Perhaps posting in one of the Power Mac G4 & G5 Forums, would generate more interest.
Good Luck!
ali b

Fans only run slow, not fast on PowerMac G5 Dual 2.3

I've noticed recently that some occasional kernal panics seem related to the fact that under a heavy load my processor fans are not revving up. This is on my olde PowerMac Dual 2.3 from some time ago. We have the same model at one of our workstations at work and the fans kick in and out as we render, so I know what a healthy PowerMac G5 Dual 2.3 should sound like.
I've checked inside the case... the two fans in front of the processors are running, just really slow. The same with the two rear fans. I can't get them to spin up faster when doing anything processor intensive. Seems like it's been like this for a while, though it was definitely not always like this as I recall a few mornings where I found it in jet engine mode.
The white tab on the clear plastic internal cover is seated correctly... I don't know where any other sensors might be.
I ran the Apple Hardware Test from my original gray install disc... upon booting into the test I was surprised to hear the fans revving up to full speed. On the first run the computer had no problems. After a reboot into the OS and then another reboot back into the test disc, the full speed fans just locked up the OS choice screen and I couldn't get past it.
I see plenty of posts here regarding loud, fast fans that won't spin down... but I don't find too many with this problem.
Can anyone shed any light on this?
Thanks,
Dave

I run BOINC on my Power G5 and it places a full load on the processors for as long as the application is up. I find the fans are not very loud if you have done a proper dust cleaning of the computer. This includes cleaning out the power supply that's located in the very bottom of the case. If you think you have a problem I suggest you look into Istat Pro from http://bjango.com/. This will allow you to look at the fan speed to determine if you have a problem or if things are running normal. Under full load, my fan data looks something like this.
Drive bay 1000 rpm
Backside 1100 rpm
CPU A intake Around 800 rpm
CPU B intake Same as CPU A
CPU A exhaust About 30 RPMs higer that CPU A intake
CPU B exhaust Same as CPU A exaust
Slots Intake 1560 RPM
The only fans that seem to change much based on load are the CPU fans and with no load they may drop to about 500 RPM. Under full load on a warm day and the system in need of having the dust clean out I have seen the fans go up to 950 RPM. The fans that made the most noise were the Power Supply fans when I missed blowing out the power supply for a while.
The G5 processor is able to run at temperatures up to the boiling point of water but it truth I have never seen mine get above 164 degrees fahrenheit.
If you have just done a good cleaning of the system, it's possible you have just returned the system to normal operation and extended it's life instead of having a problem.

G5 Dual 2.7Ghz Constant Noisy Fans

Hi there,
I'm really annoyed with this whole situation since Apple don't appear to have publicly acknowledged the noisy fans/chirping noise problems G5 users (with varying spec hardware) have been experiencing and posting about for over a year.
Anyway, here's the deal:-
My main spec is as follows: G5 Dual 2.7Ghz/4.5GB RAM/Mac OS X 10.4.6 installed on the shipped Western Digital 250GB SATA, 2nd internal 250GB SATA (Maxtor DiamondMax), 20" aluminium Apple Studio Display.
Since I performed the upgrade to 10.4.4 back in early May 2006 the fans have been constantly on as soon as the login window appears and remain at full pelt all the while the machine is on - clearly unacceptable and unusable. Fortunately for me it's not my only Mac although this is besides the point as I have now had an unusable machine for over a month and not been able to do any work with it - it is a production machine used for making music with Logic.
The bottom line is that I've not been able to make any music!
None of the suggested resolution methods that have been written about in the forums or elsewhere on the 'net (eg. installing CHUD tools etc) have made a blind bit of difference.
Furthermore, I have always had the chirping sounds since I purchased the machine in person from the Apple Store in July 2005.
For the past few weeks I was convinced that the fan problems were caused by the 10.4.4 update (when it started) and that the subsequent 10.4.6 update hadn't cured the problem.
Prior to this, I hadn't run a software update since December 2005 purely because I had heard horror stories from friends and other G5 users posting to forums etc. - if it ain't broke, don't fix it right?
I haven't really had the time to devote to trying to sort the problem out but I decided earlier today that tonight was the night to have a look at it.
Having spent all evening trying various things I am now convinced it is a hardware problem as opposed to being software related.
Here's what I tried earlier with the machine spec as above:-
1. Booted the G5 with Disk Warrior 3.0.3 boot CD
2. Ran all Disk Warrior tasks on both drives - eg, 0% fragmentation
3. Re-booted, fan noise still there from login window
4. Manually ran daily, weekly and monthly CRON jobs from Terminal - OK
5. Ran Disk Utility on main HD, repaired permissions - OK
6. Ran Disk Utility on secondary HD, verified disk - OK
7. Powered down
8. Removed all leads incl. power, monitor, all USB and Firewire
9. Removed 4GB RAM leaving 500MB stock RAM, reset the PMU
10.Ensured the removable fans (covering the RAM) were re-seated firmly
11.Replaced plastic 'door', attached monitor (DVI only) and keyboard USB
12.Re-booted, same problem, fan noise still there from login window
13.Attached Firewire HD with Mac OS X 10.3.8 installed
14.Selected Firewire HD in the Startup Disk system pref
15.Rebooted into Panther, same problem, fan noise still there from login window
AAAAAARRRRGGHHHHH!!!!!!!!!!
The last time I booted my G5 from the Panther Firewire HD (which incidentally hasn't been used since) was prior to me doing the 10.4.4 update on my G5's main boot drive and there was NO fan noise whatsoever!!!!!
Clearly I need to call and speak to someone at Apple tomorrow as the G5 is nearly one year old and I need to get this problem sorted out before it's out of warranty.
It just seems an odd coincidence that the problem started when it did!
Anyway, if any Apple techs or other G5 owners with a similar setup (specifically the dual 2.7) are reading this I'd appreciate a response or some advice for other things to try.
I'm just really frustrated and a little annoyed that having been a very content Mac user for years this is the first and only time I've ever had a problem with a piece of Apple kit.
Like I said at the top of the post, I can't believe the lack of acknowledgement on Apple's part as it would appear to be a known/common issue.
Just my £0.02.
Thanks for reading/listening.

Ok, take a look on your plastic shield, one of the bottom "tabs" should have a shiny metal coating of some sort, if it's gone or moved, then this could be the reason your fans are going "turbo".
If your fans are just at a high speed all the time, consider lowering your room temps to about 75ºF and see how it goes after a few hours/days.
It's most likely a wise decision to have the G-folks take a look at it anyway before it gets out of warranty. you might need a fan calibration or firmware change.
You still have a chance to buy AppleCare and get it registered before the 1 year warranty expires.
The Dual 2.7 is the hottest PM of the bunch, overclocked I would think.
You said the WD drive was OEM correct? Came with the PM stock?
Because the newer WD drives now have a new SATA spec that requires a SATA PCI card to function correctly in PM's.
Have you tried a complete reinstall of the OS?
Did you upgrade Tiger over Panther? (not good, less secure, previous exploits)
Do a backup, a clone of your boot drive to a external using Carbon Copy Cloner (check in the forums for their advice!) would be better.
the c boot off of Tiger install disk (not upgrade version) and from the installer menu Disk utility Erase w/Zero the boot drive (takes longer but writes are more reliable) and then reinstall Tiger, software update till clear, reinstall iLife '06 and all apps from fresh sources, avoid Migration Assistant (too blind, no app DRM copies) install files and see if your fan problems return.
Sometimes if Mac OS X is not operating correctly it won't tell the hardware to turn the fans down.
Don't install any OS/root level/admin password type programs or hacks until you've had a chance to clone that pristine puppy to a external drive (preferably 2) and keep it disconnected for safekeeping.
It's takes practically no time to option boot off a clone to recover, repair or reverse clone to the original drive. If your exploited, first c boot and Zero the infected drive before hooking up and option booting off the clone of course.

PowerMac G5 Dual 2.5 - Only Boots with Side Cover and Fan Guard OFF!!

I have the strangest problem with my PowerMac G5 Dual 2.5. This has been my Pro Tools rig forEVER.
At some point early last year, my Mac wouldn't boot. It would not see the hard drive, and would show that dreaded alternating icon in the middle of the screen indicating as much. I tried resetting, tried power off/on, tried resetting PRAM. Nothing. I took the cover off, and fan guard off to get at the hard drive. Verified the data and power cable were seated in hard drive. Cover still off, I booted up the system. Voila!!! Booted right up like nothing was ever wrong. I put the cover back on, and went about my business, passing it off as a one-off power glitch (the power in my house ***** rocks). Next time I rebooted the Mac, the exact same thing happened.
I can repeat this at will. If I leave the cover on, the system will not ever, ever boot. The minute I take the cover and fan guard off, causing the fans to spin at max speed when turned on, the system boots without issue. So, I reset PRAM and PMU. I even tried replacing that green/white cylindrical battery on the motherboard. Reseated power/data cable on hard drive. ****, I even tried a different hard drive and memory (explained below). No change.
Since then, I have relegated this system to the emergency backup system, and procured Dual 2.7 G5 PowerMac. I transferred the pro tools cards, hard drive (without formatting it) and memory (8 GB) to this new 2.7, and have not had a single, solitary issue with it. So, I know it's not the hard drive, memory, OS install, or Pro Tools cards.
What in the name of the Apple Gods could be causing this issue? Any ideas at all?

Hi Chris,
Good info & work so far, but indeed strange, only thing I can think of is something to do with that little switch for the fan cover... near the bottom as I recall, but it may be some kind of short in it's circuit.

Dual 2.7GHz PPC G5 - Fan Problem

Hello,
I have an Early 2005 Dual 2.7 GHZ PPC G5 running 10.5.8. Recently, my fans have started operating at a high speed. This now happens every single time I boot and it happens immediately after pressing the start button (before the OS loads). Because of this, I would guess this is a hardware problem. I have done everything I know to do and nothing has fixed this problem. My system temperatures appear to be normal but the fan noise is annoying. Here is what I have tried:
Zapped PRAM
Replaced PRAM Battery
Reset NVRAM
Reset the PMU Button on the Motherboard
Trashed Energy Saver Preferences
Ran the Extended Apple Hardware Test - no problems found. (Interestingly, the fans did NOT run at high speed when I booted from this disc).
The system even passed the Apple Service Diagnostic 2.5.8 with no issues.
I didn't see any evidence of a coolant leak but I did not dismantle that system to inspect the processors/board under it.
The plastic air deflector shield is in place and the sensor appears to be working because the red light illuminates on the board when I remove the shield.
I have not tried Thermal Calibration because I have read about a possible bug with that process (ASD 2.5.8). Not sure if that process is safe or not.
I have not modified the boards or processors (or anything) to warrant Thermal Calibration so I'm not really sure if it is needed.
I don't know what else to try - except to take the machine to the Apple Store.
Does anyone have any more troubleshooting ideas?
Thanks!
Chris Ratchford
Columbus, OH

Hi Chris,
I think Thermal Calibration is the only thing that would help, but I doubt any Apple Store still works on G5s... no idea on the concern about the bug bricking it, have not personally seen it, but have seen many successes.

Powermac G5 Dual 2.0 thermal calibration issue - Fans on full blast!

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Hi, ASD has never been available to the public, but even if somebody had any clues or other suggestions, you & Apple are the only ones that can see your eMail in your profile.

I have a dual 2.7ghz powermac with the 6800GT, would installing the ultra's

I have a dual 2.7ghz powermac with the 6800GT, would installing the drivers for the apple 6800 ultra make my computer recognize the video card as an ultra? the ultra and the GT that are put into the dual 2.5 and 2.7 are both the same card as far as I can tell.( many cards are the same to their faster version just different drivers). if I could get a copy of hte ultra drivers cd would that make my 6800GT into a 6800ultra? inessence overclocking the videocard?
powermac dual 2.7 G5, imac G4 800mhz, emac 1ghz, dual 2ghz powermac Mac OS X (10.4.3)

since installing the drivers will not change the card is there a way to do it?...... here is a quote from another source about the 6800 cards...As you probably know by now, the GeForce 6800 is based on NVIDIA’s NV40 graphics core. In AGP form, this is the exact same chip NVIDIA uses for GeForce 6800 Ultra and GeForce 6800 GT, only it has four of its pixel pipelines disabled, and one vertex unit turned off. (More specifically, NV40 sports sixteen pixel pipelines, these pipelines are organized into groups of four and are known as “quads”. The GeForce 6800 GT and Ultra have all four quads running with four pixel pipelines per quad for a total of 16 pixel pipelines. In GeForce 6800, NVIDIA turns off one of the four quads, leaving only three quads running for a total of 12 pipelines).
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Thermal issues with PowerMac G5 Dual 2.0 Processor

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I am a starving designer and desperate to fix my biggest tool. Please let me know of any possible suggestions or cheap fixxes. If there is no way around replacing both processors, please let me know of any good mac processor retailers! Thanx all!
-Aron
Powermac G5 Dual 2.0 Processor Mac OS X (10.4.5)

You can check the temps and fans with
http://www.bresink.de/osx/HardwareMonitor.html
or
http://www.kezer.net/thermographx.html
Who has told you what the problem is? Has the G5 been in the shop?
Is there a pattern to the loud fan noise?
Is there a red light on inside?
How warm is the room?
Is there a dust build-up inside the G5?
A simple thing, but is Energy Saver - Processor Performance set to 'Automatic'?

Solution to ati x800 xt related fan noise

i am so happy, that i need to share this with everybody else:
a few weeks ago i decided to upgrade my gpu to tht ati x800 xt. i won't bore you with the fact, that it is a great card, fast and - truely - silent. the problem was that the due to the heat of the card the pci slot fan, just beneath the superdrive, started spinning at over 43% (i am using the hardware monitor tool for measurements http://www.bresink.com/osx/HardwareMonitor.html).
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a) replacing the pci slot fan
b) replacing the x800 xt fan
c) lowering the speed of the pci slot fan
d) replacing the gpu
it took me a week, until i bumped into the following page:
http://www.barefeats.com/radx800.html
if you read further down you we will notice that some of the tests were done with an overclocked ati x800 xt. greedy as i am, i forgot about the noise and decided to hunt for even more gpu speed. and there i went to http://thomas.perrier.name/software/ATIcceleratorII.html and downloaded the aticcelarator tool. and there it struck me:
as soon as i increased the speed by increasing the card's clock speed, well, the pci slot fan went to 46%. yes, you read me. if you do the exact opposite, you will lower the fan speed.
and here is the solution that works for me:
to reduce pci slot fan noise, underclock the card to
core 475 -> 445 (-5%)
memory 499 -> 472 (-5%)
and since my powermac g5 2.0 ghz has reached a pci slot fan speed of 41%. just slow enough to be under my annoyance level. you will need to play around with the parameters, since (ati clock speed =) ati heat + mac heat + ambient heat will impact the pci slot fan.
cheers
philip

Hi Tangier,
did you install the necessary drivers? ATI DISPLAYS 4.5.7.
Works perfectly on both my G5/Dual 2.5 and G5/Dual 2.7. If it still does not work try to reinstall the latest Combo update, presently Mac OS X 10.4.8 Combo Update (PPC)
If this answered your question please consider granting some stars: Why reward points?

Tried to replace RAM but now computer not starting...PowerMac G5 dual 2.0 - are my hard drives safe? What's up?

Hello - I tried to increase the RAM in my old and trusted Power Mac G5 (dual 2.0...2005) tonight and now I'm in trouble. It has only 4 slots for RAM. It came installed with 2X256 and 2X512 ram cards. I bought 2X 1GB of Ram from Crucial.com after sending them the specs of my computer they assured me it was the right RAM. I installed the RAM just how the youtube tutorials instructed.... I replaced the 2 256 cards with the new 1GB cards and closed up the computer......note: I also "dusted" the inside of the mac very carefully and lightly with a barely damp rag.....
I plugged her in and the power button light immediately went on but the computer did not. The button wouldn't respond to being held down either. No sign of a startup or a fan noise. Nothing on the screen, no signal.... Nothing..... So I tried reversing the order of the RAM, I installed the 1GB along with the 512's. Nothing again, just the light turns on when I plug her in. Then I returned the RAM to the original configuration.....again NOTHING...just the light on.
I reset the SMU. (little button underneath the RAM area) I haven't tried to reset the PRAM yet, but I'm pretty sure that will not work either as she is not starting up at all....just the light is on... I didn't get a noticeable shock or static spark during the entire operation either. ****....whats up?
Are my Hard Drives safe in there?
Any ideas out there? Thanks in advance to your advice, T

ToddMusic wrote:
note: I also "dusted" the inside of the mac very carefully and lightly with a barely damp rag.....
Are my Hard Drives safe in there?
Any ideas out there? Thanks in advance to your advice, T
Ouch! That was not the way to get dust out. Running that damp rag anywhere near an electronic component, even if you were wearing a properly grounded writs strap, was way dangerous.
Did you lay the machine on its left side when you replaced the RAM? That is much safer (though the recommendation only shows up in the service documentation, not the user guide, for some reason).
What I would do at this point is to remove all RAM and try to power the machine. If other stuff is OK, you won't start but you will see the lunar LED flashing in a repetitive pattern above the power switch. If you don't see that happening, then things are exceptionally serious.

I changed permission setting on main disk...took forever now when I bootup I get the chime...apple icon...fan noise...thats it...internal drive is broken...no Mac install disk..I have a windows XP desktop with installation disk..if I was to get external d

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Hi Romko23, just pasted info from manual...PowerBook G4 "17" 5.3
Your PowerBook comes with a minimum of 512 megabytes (MB) of 533
MHz Double Data Rate (DDR2) Synchronous Dynamic Random-Access Memory
(SDRAM) installed. Both memory slots can accept an SDRAM module that meets the
following specifications:
Â Double Data Rate Small Outline Dual Inline Memory Module (DDR SO-DIMM) format
Â 1.25 inch or smaller
Â 512 MB or 1 gigabyte (GB)
Â 200-pin
Â PC2-4200 DDR2 533 MHz Type RAM
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Message was edited by: CMK1

PowerMac G5 Dual 2.7ghz FAN Noise

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