Solution to excessive fan noise on Power Mac G5?

Discussion in 'PowerPC Macs' started by Nein01, Mar 11, 2010.

  1. Nein01 macrumors 6502

    Nein01

    Joined:
    Dec 1, 2009
    Location:
    Germany
    #1
    ok, so i'm not sure if this is just a coincidence or not just yet, but after uninstalling LCC (logitech control center), my fans have been acting NORMAL! for HOURS so far! :eek:

    constant, loud fan noise is an issue i have been having for a very long time, and apparently so have many other G5 owners. during my search for a solution, i came across several webpages full of posts from users in distress over the same problem i was having.

    apple tried replacing the logic board - nothing.
    tried pram reset - nothing.
    tried creating a new user account - nothing.

    couldn't use smcFanControl because of the PPC chips.

    long story short, i gave up on it and just suffered through the annoyance of having fans that were louder than any music, movie or game being played at a normal volume. i can't believe that in all my searching for an answer that i never came across anything that suggested i uninstall my logitech mouse drivers.


    so i guess that's why i'm posting this.. for others who may be having the same problem and nothing else has worked, hopefully google can help them find this thread. if you are using logitech drivers for your mouse or keyboard, uninstall them! i switched to SteerMouse about six hours ago and haven't been disturbed by my fans since then. hopefully this is the real deal! i'll post an update if the problem comes back.
     
  2. Nein01 thread starter macrumors 6502

    Nein01

    Joined:
    Dec 1, 2009
    Location:
    Germany
    #2
    sorry, false alarm.

    looks like it was just a coincidence.


    :(...
     
  3. 300D macrumors 65816

    300D

    Joined:
    May 2, 2009
    Location:
    Tulsa
    #3
    Knowing what G5 you have would be a huge help to us. A G5 should have quiet fans unless the CPU(s) are hot or there is a high electrical demand to the expansion slots (multiple video cards, raid card, etc).

    Get iStat pro and check your fan speeds, they should be about the same as this:
     

    Attached Files:

  4. Transporteur macrumors 68030

    Joined:
    Nov 30, 2008
    Location:
    UK
    #4
    So are the fans just running faster than normal, or are the fans generally loud?

    If you simply got loud fans (even at lowest speeds) you could swap them for more silent ones, which is what I did with my late 2005 G5.
     
  5. rickvanr macrumors 68040

    rickvanr

    Joined:
    Apr 10, 2002
    Location:
    Brockville
    #5
    Which graphics card do you have? I had the 6800 Ultra in my water cooled G5 and the whole thing always sounded like a diesel engine.

    It quieted down a bit after I did a PRAM reset, and SMU reset but eventually it got back to its trusty industrial wind tunnel noise levels.

    Mine could have been slowly leaking coolant though, I don't know if that happened over time, or just suddenly. If it was a slow process, that could explain the fans going faster trying to compensate.
     
  6. Nein01 thread starter macrumors 6502

    Nein01

    Joined:
    Dec 1, 2009
    Location:
    Germany
    #6
    sorry i never mentioned the specific model. it's a 2.0ghz that i bought in May of 2005. i think the liquid cooled systems had just come out at that time but i didn't go that route.

    Model Name: Power Mac G5
    Model Identifier: PowerMac7,3
    Processor Name: PowerPC G5 (2.2)
    Processor Speed: 2 GHz
    Number Of CPUs: 2
    L2 Cache (per CPU): 512 KB
    Memory: 3 GB (originally had 1gb)
    Bus Speed: 1 GHz

    graphics: ATI Radeon 9600 XT


    i came back to this thread to say that the problem in fact HAS improved significantly ever since i uninstalled LCC, although i still have the occasional sudden burst of loud fan noise for no apparent reason, which can last for several minutes at a time or longer and sounds similar to a kernel panic. i haven't done any cpu intensive work on this computer for a long time now, since my school has new imacs, so it really bothers me that i have to suffer through this noise sometimes when all i'm doing is listening to music, watching a movie, or browsing the web.

    to 300D, i do in fact have the iStat pro widget, so i will try to remember to post my fan speeds the next time i catch them being obnoxiously loud.

    for now though, here is the fan reading while it's quiet (only safari is open):

    [​IMG]

    only the CPU B intake and CPU B exhaust readings are fluctuating. they are going up to around 1400-1700rmp with a soft hum. at the 300-400 range (the lowest i saw) it's very quiet. all the other fan readings are staying exactly the same as they are in the pic.




    edit: just woke my computer up from sleep mode and the noise started instantly

    [​IMG]

    still nothing but safari running. looks like CPU B speeds went up a couple hundred more rpm than the max they were at before, but the noise coming from my computer is exponentially louder, like a kernel panic.

    only other difference is that the drive bay fan went up to 1048 from 1000 and some temperature changes have occurred -- however, the CPU A temperature went from 1 degree celsius to 41 degrees while every other temperature went down (which seems normal since my computer was in sleep mode for a while)
     
  7. 7hunderbird macrumors newbie

    Joined:
    Jun 11, 2013
    Location:
    UT, US
    #7
    Ideas are intriguing to me and I wish to subscribe to your newsletter

    http://www.youtube.com/watch?v=wlMwc1c0HRQ

    Transporteur, what fans did you get and where?
     
  8. MisterKeeks macrumors 68000

    MisterKeeks

    Joined:
    Nov 15, 2012
    #8
  9. Soleon macrumors newbie

    Joined:
    Jan 15, 2018
    #9
    Not sure if anyone will be able to help me with this kinda thing 8 years after this thread was last active, but I've got a PowerMac G5 with the dual 2.3 processor, and I'm having an issue with fan noise. I have a trial of iStat on, and it confirms my visual inspection of the weird blower-looking fan by the hard drive, presumably the "Backside" fan running at 3000 RPMS. It's extremely noisy, and I'd love to find a way to make it chill out without simply unplugging it or removing it. Somewhat interestingly, I've found my four main processor fans won't spin above about 500RPMs, which seems weird, since the processor is at around 65C (I'm American but my temp program was set to Celsius so I'm familiar with it in that regard now) but maybe there's some kind of hardware or software issue causing the backside fan to run super high and the processor fans to barely run? The yellow light that indicates the clear cover is open isn't lit, but does light if I remove the cover. Any ideas would be greatly appreciated.

    As to why I'm using a dinosaur like this 13 years later - my main PC is a rig I built a year or so ago, but my motherboard failed, and I need a PC to use while it's shipped off (fortunately under warranty). So I booted up the old PowerMac, and it works fine, but this fan noise is new - I'm used to it going full leafblower when I'm making it work, but that's a deep, throaty noise from those processor fans, and this is just an annoying, tinny whistling that starts about a minute after I turn the thing on and doesn't stop for anything, no matter how little or much the computer is doing.
    Thanks in advance!
     
  10. RhianB macrumors 6502a

    RhianB

    Joined:
    Sep 3, 2016
    Location:
    505 USA
    #10
    Hi. If you have an Apple service diagnostic disc, boot from it to check your PMG5 temperature sensors, recalibrate your fans for better operation - all sorts of neat stuff. Also, it sounds like the box sat around for quite a while - It would be worth popping it open and cleaning it out. Here's a video of a guy using ASD to work on a unruly PMG5.



    Good luck :)
     
  11. AphoticD, Jan 15, 2018
    Last edited: Jan 15, 2018

    AphoticD macrumors 65816

    AphoticD

    Joined:
    Feb 17, 2017
    Location:
    Australia
    #11
    I’ve found the drive bay fan is quite noisy in my DP G5s (prior to the late ‘05 model). This seems to be the first fan to rev up to full speed and makes it sound like it’s getting ready for take off.

    You could try cleaning out any dust from the fans (and PSU) and applying new thermal paste to the CPUs to reduce heat. Also, check that the air deflector sensor is working by removing the perspex door while it’s running. If the fans speed up when removed then it’s as it should be, if they stay the same then it could be just a failed sensor (in one of the bottom grooves for the door) causing constant fan overdrive.

    Also, it’s a big job, but you can move the drive bay sensor down from that top hot air pocket above the HDDs and stick it underneath the drives instead. It requires a complete teardown of the tower but should reduce the drive bay fan from firing up as much.

    Another thing to check is the HDD(s). Old (original stock) HDDs are going to run hotter than more recent (2010+) drives. If you’re replacing the HDD, make sure it’s a model which is SATA II (3G) spec or a SATA III spec which can be jumpered down to 3G. SSDs are another option and in my experience in the G5, a modern SSD is cooler running than a 15 year old 7200rpm thrasher.

    Lastly, I had a 9800 Pro Mac Edition GPU for many years and I thought my G5 was just noisy as it always made a high pitch fan noise, which would come on at seemingly random times. I replaced the GPU and the high pitch fan noise was gone. In short; the noise may be the GPU’s little cooling fan and not the G5.
     
  12. Soleon macrumors newbie

    Joined:
    Jan 15, 2018
    #12
    Hey, thank you for the rapid response, I really appreciate it!
    Great video, thanks for showing me- do you think I'd still be able to get hold of one of these ASD discs? I searched it up and some thread suggested calling Apple and demanding one... Think that may yield some results?
     
  13. AphoticD macrumors 65816

    AphoticD

    Joined:
    Feb 17, 2017
    Location:
    Australia
    #13
    A quick search reveals this zip of the dual boot DMG: (216.3MB)
    http://www.dreamsupport.us/downloads/apple-mac/Apple_Service_Diagnostic_Disks_25_GB/ASD v 2.5.8 Dual Boot CD (2005)/ASD 2.5.8.dmg.zip

    Download and burn with Disk Utility, then pop it in and check the Read Me file for instructions on booting.
     
  14. Soleon macrumors newbie

    Joined:
    Jan 15, 2018
    #14
  15. AphoticD macrumors 65816

    AphoticD

    Joined:
    Feb 17, 2017
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    Australia
    #15
    No problem. I have a feeling if you called Apple and asked for it (or demanded it), they might say something like "What's a G5?"
     
  16. Soleon macrumors newbie

    Joined:
    Jan 15, 2018
    #16
    I bet you're right. They'd balk as soon as I mentioned the IBM (not Intel, gasp) processor
     
  17. RhianB macrumors 6502a

    RhianB

    Joined:
    Sep 3, 2016
    Location:
    505 USA
    #17
    What's a G5?

    :D

    If you REALLY want to blow their minds, show them the built in clear plastic lunch tray Steve & Woz were thoughtful enough to engineer into it.
     
  18. Soleon macrumors newbie

    Joined:
    Jan 15, 2018
    #18
    HAha, very true. (I apologize for any typos, I'm on the G now ad its porcessor fans are clearly not doing their job)
    I downloaded and burned the image to a CD, and stuck it in the drive and used first C, and then Cmd Opt Shfft Del, but the screen I got was grey with a small icon blinking between a Finder logo and a question mark. Any suggestions?
     

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