8 Replies Latest reply: Nov 9, 2010 8:51 AM by MGW
Shane Lycett Level 1 (0 points)

My MAC OSX 10.4.11 kills itself every 15mins, even if the computer is in use. is there a shutdown setting I am missing?

I have fiddled with energy saver options and booted in safe-mode and repaired permission but no joy.

Machine Name: iMac G5
Machine Model: PowerMac8,2
CPU Type: PowerPC G5 (3.1)
Number Of CPUs: 1
CPU Speed: 2 GHz
L2 Cache (per CPU): 512 KB
Memory: 1.5 GB
Bus Speed: 667 MHz
Boot ROM Version: 5.2.5f1
Temp CPU 47.5c HD 35c

Kind regards,

  • Carolyn Samit Level 10 (103,360 points)
    Hi Shane,

    Try resetting the SMU, instructions here.

  • Shane Lycett Level 1 (0 points)
    Ok my mac was produced 19th May 2005. I turned off, removed power cable and waited. When I turned it back on the problem is still unresolved however the computer did seem to stay on for longer (maybe thats just in my head tho)

    Kind regards.

  • MGW Level 7 (27,025 points)
    Since your G5 is not an iSight, take the back off and inspect the capacitors on the logic board and in the power supply unit for swelling and/or leakage. Make sure there is no dust blocking the air vents and that the fans are dust free.

    You might also go to User>Applications>Utilities>Console and type in maximum heat exceeded and see what pops up. It sounds as if your power supply and/or your caps are defective.

  • Shane Lycett Level 1 (0 points)
    I downloaded a temperature monitor and the temp are CPU 44.6c HD 39.5c SMART disk 49c, they don't fluctuate that much, I opened up the Mac and everything appears fine.

    may a rebuild fix it?

    could the problem be with the power cable? could i try my intel based mac cable?
  • MGW Level 7 (27,025 points)
    I have no idea if the cables are interchangeable, but try booting Safe Mode (to "Safe Boot")

    1. Be sure the computer is shut down.
    2. Press the power button.
    3. Immediately after you hear the startup tone, press and hold the Shift key.
    Tip: The Shift key should be held as soon as possible after the startup tone but not before.
    4. Release the Shift key when you see the gray Apple and progress indicator (looks like a spinning gear).

    During the startup in Mac OS X 10.2 through 10.3.9, you will see "Safe Boot" on the Mac OS X startup screen.

    During the startup in Mac OS X 10.4 or later, you will see "Safe Boot" on the login window, which appears even if you normally log in automatically.

    To leave Safe Mode in any version of Mac OS X, restart the computer normally, without holding any keys during startup.

    If the computer works normally and doesn't shut down after you have been running in safe mode for an hour or so, then you have some sort of software problem in your main account.

    Your fans will be loud, and you will only be able to connect to the internet using an ethernet cable.

    You can also create a new account and boot from that, again, if everything is normal, then there's some kind of corruption in your main account.


    Message was edited by: MGW
  • Shane Lycett Level 1 (0 points)
    Since opening the Mac and blowing some components it is on and has stayed on.. i will leave it on overnight and hopefully if its still on in the morning then it should be cured.. i will post back in the morning.

    Kind regards,

  • Shane Lycett Level 1 (0 points)

    There must have been some dust sumwhere their shouldnt have.


  • MGW Level 7 (27,025 points)
    Great to hear, and you're welcome!