lazerpouf

Q: Power Mac G5 Dual Core gets hot and fans run slow

Hello

 

I have a Power Mac G5 (Late 2005) Dual Core that has fan problems. The temperatures get high and the fans barely spin up. The CPU fans sit at 499 and 515 rpm and when playing Minecraft they go to about 600 rpm and the CPU gets up to 151F. I have ran Apple Hardware Test and it still doesn't work. It is running Mac OS 10.5 and has 6 GB of RAM and has a 500GB hard drive. I have:

  • Reset PRAM
  • Re-installed Mac OS X
  • Replaced Hard Drive
  • Cleaned dust
  • Ran AHT
  • And reset the SMU
  • Tried editing AppleFan.kext

iStat pro says the fans spin about:

CPU A intake: 499 rpm

CPU A exhaust: 515 rpm

CPU B intake: 499 rpm

CPU B exhaust: 515 rpm

Backside: 1000 rpm

Slots: 1500 rpm

drive bay: 1000 rpm

 

Is this normal? Do they always spin slow or is there any other things I can do or software to download?

PowerMac, Mac OS X (10.5)

Posted on Feb 15, 2016 4:00 PM

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Q: Power Mac G5 Dual Core gets hot and fans run slow

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  • by BDAqua,

    BDAqua BDAqua Feb 17, 2016 9:59 AM in response to lazerpouf
    Level 10 (123,670 points)
    Feb 17, 2016 9:59 AM in response to lazerpouf

    Seems it must be the Logic Board, but one last long shot...

     

    Does it boot into Open  Firmware with CMD+Option+o+f ?

     

    Type these commands at the prompt...

     

    reset-nvram (press Enter)

    set-defaults (press Enter)

    reset-all (press Enter)

     

    https://www.powermax.com/product/pow-t52695

     

    https://www.powermax.com/product/pow-t58139

  • by lazerpouf,

    lazerpouf lazerpouf Feb 17, 2016 10:21 AM in response to BDAqua
    Level 1 (0 points)
    Feb 17, 2016 10:21 AM in response to BDAqua

    Hi

    I am getting Hardware Monitor and going to see if it does a better job monitoring the fans.

     

    When copying files (Just copied 200MB of Minecraft stuff), the CPU goes from 80º to ~102º.

    When playing minecraft, CPU A was at 120º and the fans (intake for CPU A: 499 rpm, exhaust for CPU A: 515 rpm.)

    I tried the commands in open firmware, they worked; but that didn't fix the fans. Also the hard drive is making a constant weird noise every second (not grinding) and no activity shows in iStat Menus.

  • by BDAqua,

    BDAqua BDAqua Feb 17, 2016 11:08 AM in response to lazerpouf
    Level 10 (123,670 points)
    Feb 17, 2016 11:08 AM in response to lazerpouf

    Also the hard drive is making a constant weird noise every second (not grinding) and no activity shows in iStat Menus.

    The fact that it doesn't show activity to me would mean that the Disk itself is having problems & without OS interaction is trying to correct it.

     

    Those temps °F. or °C. ?

  • by lazerpouf,

    lazerpouf lazerpouf Feb 17, 2016 11:28 AM in response to BDAqua
    Level 1 (0 points)
    Feb 17, 2016 11:28 AM in response to BDAqua

    Yes, the disk might be having problems itself.

    The other one made a click noise when it started up after I was using the computer for a long time. Then it shut off and turned back on again. This one is a 500GB disk that I took out from a PC. I'm surprised that it is already failing. This happened right after I reinstalled Mac OS X.

     

    The temps are in ºF.

     

    Oh, the sensor for the hard drive could be reporting a low temperature (I saw in another fourm on http://www.xlr8yourmac.com/ that the hard drive sensor was not close to the hard drive so the hard drive failed. It can be solved by moving the sensor I think.) The hard drive could be getting too hot and the fan is not spinning up.

     

    I saw a logic board for $6 on PowerBookmedic.com and I will probably get it and move the HDD temp sensor, or maybe just get a SSD.

  • by BDAqua,

    BDAqua BDAqua Feb 17, 2016 11:48 AM in response to lazerpouf
    Level 10 (123,670 points)
    Feb 17, 2016 11:48 AM in response to lazerpouf

    Those temps are OK then, & possibly even the fan speeds OK, if you boot with the alt key held down & let it sit on that screen for a few minutes, do the fans speed up?

  • by lazerpouf,

    lazerpouf lazerpouf Feb 17, 2016 1:13 PM in response to BDAqua
    Level 1 (0 points)
    Feb 17, 2016 1:13 PM in response to BDAqua

    No, they do not spin up when at the Startup Manager.

    But they do spin up to max when in ASD or Single-User Mode.

    (It's really loud)

    They are spinning fast when at the Startup manager.

  • by lazerpouf,

    lazerpouf lazerpouf Feb 17, 2016 4:08 PM in response to lazerpouf
    Level 1 (0 points)
    Feb 17, 2016 4:08 PM in response to lazerpouf

    I tried to install Hardware Monitor and Temperature Monitor, but when I open either of them it says:

    "Warning: The resources of this application has been damaged! Please install using a original distribution package."

    I don't know why it does this, and I created a new user to see if it will help. Since it does not work, I cannot read the temperature sensors and the fans.

     

    Is there anything else that I can do to fix this/ fan issue, or should I get a new logic board?

    Why do you think that the fans wont spin up or the LB would have this problem?

  • by lazerpouf,

    lazerpouf lazerpouf Feb 17, 2016 4:27 PM in response to lazerpouf
    Level 1 (0 points)
    Feb 17, 2016 4:27 PM in response to lazerpouf

    Also, the computer has a shutdown delay; before when it shuts off. Could that be logic board related also?

  • by Drew Reece,

    Drew Reece Drew Reece Feb 17, 2016 4:35 PM in response to lazerpouf
    Level 5 (7,552 points)
    Notebooks
    Feb 17, 2016 4:35 PM in response to lazerpouf

    Where are you getting the hardware monitor installer from? What version? It seems like a generic 'this app is mangled - reinstall' error to me. Did you get the old version?

    http://www.bresink.com/osx/LegacyProducts.html

     

    I thought your Mac was OK now? The temps reported earlier look OK, it is running 'really loud' which seems appropriate - these machines were really loud when in ASD/ AHT.

     

    Startup manager may not spin the fans at full blast, I can't recall them being too loud at that stage. 

     

    Can you boot normally & watch the temp & fan values? Use iStat if hardware monitor won't work.

    If you want to stress test the CPU's use this…

    http://osxdaily.com/2012/10/02/stress-test-mac-cpu/

    See if the CPU's ever go up to 151ºF like before.

     

    lazerpouf wrote:

     

    Also, the computer has a shutdown delay; before when it shuts off. Could that be logic board related also?

    Hmm, possibly or it could just be how +10 year old hardware operates. I also see delays on shutdown sometimes on an Intel Mac Pro. So long as it boots who cares?

  • by lazerpouf,

    lazerpouf lazerpouf Feb 17, 2016 5:05 PM in response to Drew Reece
    Level 1 (0 points)
    Feb 17, 2016 5:05 PM in response to Drew Reece

    I got it from the leagcy downloads page and I got version 4.99 which is compatible with Leopard. I also eMailed the company.

     

    The fans will still run slow even when its at 151º.

    BDAqua said the slow fans is a logic board problem.

    According to the picture that BDAqua found earlier, the temp of cpu a was 127ºf and the fan was 900rpm. If mine was at 151ºf it would be at 499 rpm. I want my fans to spin faster like BDAquas, but it could be a LB problem.

    I will download the iStat pro widget and do the stress test soon, however Hardware monitor works on another 27" iMac running Mavericks; only from the disk image.

     

    Why do the fans not spin up when they need to?

  • by Drew Reece,

    Drew Reece Drew Reece Mar 2, 2016 2:25 PM in response to lazerpouf
    Level 5 (7,552 points)
    Notebooks
    Mar 2, 2016 2:25 PM in response to lazerpouf

    BDAquas results are from a liquid cooled Mac. The results you found earlier are from a liquid cooled Mac. Both list 'CPU Pump A'.

    I don't think these models are suitable for comparing. The heat sink is different, the CPU's put out more heat on LCS models…

     

    You haven't managed to see results from the same model yet, so unless I am missing something your figures are mostly guesswork as to what is 'normal'.

    I just found this…

    http://forums.macrumors.com/threads/dual-core-g5-temperature.171145/


    What is your room temperature like? A cold room can cause more efficient cooling, it's freezing where I am so my computer fans don't spin much until the heating has got the room above 22ºC or I am really loading the CPU & GPU. BDAqua's air inlet is around 23ºC, any idea on your room temp?

     

    Load up all 4 CPU's & see if it the temp goes high, the fans should begin to cool it. It will shutdown unexpectedly if the CPU's get too hot!

     

    The only way I know to reduce CPU temp on G5's is via the 'Reduced performance' setting, I think it is in the Energy saver section of System Preferences. I don't recall any third party tools to increase fan speeds on PPC (SMC fan control is Intel only).

     

    <Edited by Host>

  • by lazerpouf,

    lazerpouf lazerpouf Mar 2, 2016 2:27 PM in response to Drew Reece
    Level 1 (0 points)
    Mar 2, 2016 2:27 PM in response to Drew Reece

    Hi

     

    It is usually 68ºf, right now it is 65ºf.

    According to the software you suggested, the ambient temperature if the computer is 63.5ºF.

    I put the CPU performance on 'highest'.

    The highest the fans have gotten is 804/829 rpm.

     

    Here are the pictures:

    Picture 2.pngPicture 15.pngPicture 11.png

     

    <Edited by Host>

  • by BDAqua,

    BDAqua BDAqua Feb 18, 2016 11:28 AM in response to lazerpouf
    Level 10 (123,670 points)
    Feb 18, 2016 11:28 AM in response to lazerpouf

    As Drew mentions, if we could see those reading under full load we might tell more, perhaps dnetc running RC5-72?

     

    http://www.distributed.net/Download_clients

  • by Drew Reece,

    Drew Reece Drew Reece Mar 2, 2016 2:28 PM in response to lazerpouf
    Level 5 (7,552 points)
    Notebooks
    Mar 2, 2016 2:28 PM in response to lazerpouf

    Personally I wouldn't worry about those (assuming you loaded up the CPU's).

    Your 63ºF to 68ºF is around 17ºC to 20ºC. I think that is a cool room. Average room temp seems to be a few degrees higher (it's a fuzzy term).

     

    Your fans do seem to spin up as the CPU temp rises. Raise your room temperature if you want to see them go to 1000 rpm (or to confirm they are capable of that).

     

    Macs that don't manage CPU temp generally end up crashing badly. It seemed to be a complaint with some liquid cooled models. Have you had any crashes?

     

    Care & patience can get you through it

     

    <Edited by Host>

  • by lazerpouf,

    lazerpouf lazerpouf Feb 18, 2016 11:59 AM in response to Drew Reece
    Level 1 (0 points)
    Feb 18, 2016 11:59 AM in response to Drew Reece

    Shouldn't the fans spin way faster than 800 rpm if it is at 157ºF?

    I have not had any crashes since I got the mac.

     

    Why should I replace the thermal compound? Does that make the fans spin faster or do anything else?

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