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  1. #1


    Member Since
    May 20, 2006
    Posts
    41
    Specs:
    PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB
    G5 Randomly Powers Down
    I bought a used PowerMac G5 about a month and a half ago and in the last week, the system has started turning itself off. I tried searching for a solution on the forum and found nothing that was similar to my problem. I searched the web and found a few random issues. I tried reseting the PRAM and it seems to help for a few hours, then it turns off. If I turn the system back on without a reset, it will last about 10 minutes or so. Is there a part I have to replace or is this a major issue that is not fixable? I have the dual 2.0Ghz G5 which I believe is the late 2004 model.

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,094
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Trust you received the system restore discs with the machine as it sounds like you have a serious hardware/heating problem.

    If so pop in disc one, reboot and hold down the option key, and go to Apple Hardware Test and run the full test program. If you do not have the discs, give Apple a ring and see if you can purchase a replacement set. Have handy the model, processor size and serial number

  3. #3

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
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    35,075
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Building on what Harry mentioned about a possible "heating" problem...what are your PowerMac G5's fans doing?

    Are they:

    - on "full blast" (fans running very loudly)
    - "normal" (for your computer)
    - or no fan sound at all?

    Since you do get 10 minutes of runtime before it shuts down...download this program:

    Temperature Monitor: Description

    And launch it on startup. Watch the temperature readings to see if they increase greatly during the 10 minutes your G5 will run.

    Share with us the temp readings (min & max, from start to shutdown) so we can verify if they are "abnormal" or not.

    Good luck,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  4. #4


    Member Since
    May 20, 2006
    Posts
    41
    Specs:
    PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB
    The fans sound normal, light hum and every once and a while I'll hear the fans rev up, but it seems to be normal, like if I'm loading a program or something. I downloaded the program and I will post results when I'm finished.

    As for the Apple Hardware Test, I will contact Apple about getting this because I no longer have the discs.

  5. #5


    Member Since
    May 20, 2006
    Posts
    41
    Specs:
    PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB
    I've had the system on for about an hour now and the highest the temperature has gotten is 46.5C. I will post the boot temperature tomorrow morning.

  6. #6

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
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    35,075
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by kevinc5680 View Post
    I've had the system on for about an hour now and the highest the temperature has gotten is 46.5C. I will post the boot temperature tomorrow morning.
    46.5C is not overly high. You said previously that you only get 10 minutes before it shuts down...sounds like you got at least 60 minutes this time.

    Good luck,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  7. #7


    Member Since
    May 20, 2006
    Posts
    41
    Specs:
    PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB
    Yeah it's random. Once thing I read online was to plug it directly into the wall instead of the power surge protector. Said something about the tower may not be getting enough power. So far so good. My temp is hovering around 43C right now, only hits 45/46C when I'm doing a lot on the system. Definitely by now it would have turned off so we'll see. I'm not going to hold my breath.

  8. #8

    pigoo3's Avatar
    Member Since
    May 20, 2008
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    35,075
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by kevinc5680 View Post
    Yeah it's random. Once thing I read online was to plug it directly into the wall instead of the power surge protector. Said something about the tower may not be getting enough power. So far so good. My temp is hovering around 43C right now, only hits 45/46C when I'm doing a lot on the system. Definitely by now it would have turned off so we'll see. I'm not going to hold my breath.
    Well I guess the whole surge protector idea may make some sense...but then that means that your surge protector is faulty...which of course is better than your G5 being busted!

    Again, good luck,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  9. #9

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,094
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Download and install a widget called iStat Pro which will keep an eye on all those temperature and usage details. Try it and if you like it, and sure you will, remember it is donationware and the developer would appreciate say $5-10 for his work:-

    iStat pro, a Dashboard Widget by iSlayer

  10. #10


    Member Since
    May 20, 2006
    Posts
    41
    Specs:
    PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB
    My temperature upon boot was 81F for cpu A and 76F for cpu B. My computer didn't crash yesterday and I used it for about four hours during the Cowboys game. The highest temperature it reached was 115F for both processors and that was right before I shut down and it seemed to be hovering in that area most of the night.

  11. #11

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
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    35,075
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by kevinc5680 View Post
    My temperature upon boot was 81F for cpu A and 76F for cpu B. My computer didn't crash yesterday and I used it for about four hours during the Cowboys game. The highest temperature it reached was 115F for both processors and that was right before I shut down and it seemed to be hovering in that area most of the night.
    Sounds like things are running better without the surge protector. Now if you really wanted to abuse yourself...you could plug your G5 back into the surge protector & see if the computer powers down!

    Hopefully things have stabilized,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  12. #12


    Member Since
    May 20, 2006
    Posts
    41
    Specs:
    PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB
    I figured I would continue to update this thread for anyone else who may have a similar problem. So I think I've determined that it is not an overheat issue because I started shutting down my PowerMac when I went to work instead of putting it to sleep. The other day, I came home from work and when I turned on the PowerMac, less than five seconds later it turned off. I tried this three times and the same thing happened. I reset the SMU or VMU, whatever that button is and it worked fine.

    So I started playing back everything in my head since I got this computer a few months back. For the first month/month and a half, I never had a problem. I would play video games on it for hours at a time and no overheating, no shut offs. Then the random power downs started. What did I do differently?

    Well after going over everything, I determined the only thing I changed was from my Apple keyboard to a Microsoft keyboard. I did this because the cord was longer and easier for me to have the keyboard at longer lengths from the tower (obviously). Well since I've used this keyboard, I've had the power down issues. Four days ago, I switched back to the apple keyboard and I have not had one issue. This is probably the longest the system has gone without a crash since I started having the issue. Could this be the problem or coincidence?

  13. #13

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
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    22,094
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Problem I guess. If the KB cable is a little short you have to use the Apple extender which is a special lead and not an ordinary USB cable. This is what it is and they are very reasonably priced:-

    APP-KPRO-EXT 3ft Apple USB Extension Cable for Apple Keyboard, Apple Mac and iPod Accessories

  14. #14


    Member Since
    May 20, 2006
    Posts
    41
    Specs:
    PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB
    Here is another update, so far so good. Have yet to have a shut down since going back to Apple keyboard.

  15. #15

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,094
    Specs:
    Imac 27" Retina 5K, 512GB flash memory, 3.3GHz, 16GB memory, macOS Sierra beta.
    Sounds very much like you have got on top of it, Kevinc5680. Good job!

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