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  1. #1


    Member Since
    Jun 25, 2012
    Posts
    33
    Power Mac PPC G5 start problems
    I am a new to mac user, having switched from PCs about a month ago. I have a Power Mac G5 running OS X 10.5.8 that has start up problems - If I restart it will using do fine, but if I shut down, and power off, the thing has very annoying habits - I am so impressed with the G5 when it works that I bought another last week - it has no bad habits, but the first when powered on will display the white light, then either do nothing, or start the fans up, occasionally speeding them up to louder than the AC in the office. Nothing else happens - it does not boot up, just makes a noise with the fans.

    Sometimes, if I leave it be for ten minutes or more, it will start up, do the chord sound, and within a couple of minutes I am up and running. However, on occasion, leaving for two hours gets nothing but varying fan speeds - no chord sound, no boot up.

    The other G5 with the same OS X 10.5.8 works as I would expect. Power on, press the button, within a minute it is booted and running. I would like the other to do this, as it has a much larger hard drive and more memory, It appears to be getting worse - this morning I had to try five times, powering off and on, to get any response. Anyone any idea what is wrong?

    I do not yet regard myself as experienced with Macs and do not know much about them, so simple answers would be appreciated.
    MacPro
    OS X 10.6.8

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,269
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Sounds very much like you have a dead power supply in the G5. Subject to them being the same model G5 you could swap the drives and memory about. There are five distinct PowerMac G5 models and some of the later ones use different memory, either PC-3200 or PC-4200.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3


    Member Since
    Mar 30, 2011
    Posts
    6
    Hi

    My G5 seems to do the same, all attempts at finding the root cause have failed, my solution is not to turn it off, it sleeps and wakes on demand with no problems, so far after 6 months its running great and used every day :-) now with 3TB second drive.

    hope this helps.

    life is better with a G5

    Simon

  4. #4


    Member Since
    Jun 25, 2012
    Posts
    33
    Thanks for the replies - not particularly what I wanted to hear, . I will keep it running and see what happens. I will probably end up taking the drive out, and the memory and putting them in the other one.
    MacPro
    OS X 10.6.8

  5. #5

    Ramimac1's Avatar
    Member Since
    Dec 29, 2010
    Location
    Las Vegas
    Posts
    263
    Specs:
    2010 i3 27" 16gb Ram
    Try resetting the SMU. and PRAM. I had similar issues when i got my G5 this cleared it up

    SMU
    How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005)

    PRAM
    Resetting your Mac's PRAM and NVRAM
    Old time Computer Hardware Tech
    Ohh My Typing Sucks Live with it

    Snoopy is the Man !!!

  6. #6


    Member Since
    Jun 25, 2012
    Posts
    33
    How does one tell which version of G5 one has, to get the right reset on the SMU?
    MacPro
    OS X 10.6.8

  7. #7

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,269
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Go to About this Mac under the apple icon in the Menu Bar, More Info and details should be there.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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