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Random Shutdowns

589 Views 13 Replies Latest reply: May 20, 2012 7:00 PM by BDAqua RSS
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Apr 20, 2012 7:33 PM

My PPC PMAC has been subject to random shutdowns ever since I moved to my new apartment. I tried to clean the inside nad the problem seemed solved for the while, but...Here it is again.

 

After the shut down, if I disconnect the cable and reconnect, I get the 'double sparkle' from the blue led near the start button, and I cannot restart the machine... need to wait for a while (15 mins) then no double sparkle, the computer restarts but last about 10 mins.

 

The temp seems ok accordint to the soft checking it... I checked the web and there are similar cases, but the solutions proposed are vague and did not work...

 

any ideas?

 

Thank you!

G5 1.8 DP, Mac OS X (10.4.8)
  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Apr 20, 2012 10:41 PM (in response to eye)

    Could be many things, we should start with this...

     

    "Try Disk Utility

     

    1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.

    2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at the top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)

    Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.

    3. Click the First Aid tab.

    4. Select your Mac OS X volume.

    5. Click Repair. Disk Utility checks and repairs the disk."

     

    http://docs.info.apple.com/article.html?artnum=106214

     

    Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.

     

    (Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

     

    One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...

     

    PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive

     

    Reboot, test again.

     

    If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.

     

    Check the System Preferences>Other Row, for 3rd party Pref Panes.

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Apr 29, 2012 11:04 AM (in response to eye)

    It does sound like temperature, could be the thermal paste under the CPUs needs replacing, machine could seem cool, but CPUs would overheat in short order.

     

    Have you blown the dust out thoroughly lately?

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Apr 29, 2012 1:50 PM (in response to eye)

    Well, easiest way is to infer, get these & see if the CPU temps are inordinately high compared to the rest of the temps...

     

    Get Temperature Monitor to see if it's heat related...

     

    http://www.macupdate.com/info.php/id/12381/temperature-monitor

     

    iStat Menus...

     

    http://bjango.com/mac/istatmenus/

     

    And/or iStat Pro...

     

    http://www.islayer.com/apps/istatpro/

     

    If you have any temps in the 70°C/160°F range, that's likely it.

     

    My Quad...

    /___sbsstatic___/migration-images/182/18257899-1.jpg

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Apr 29, 2012 2:20 PM (in response to eye)

    Most Thermal Pastes need to be replaced about every 4 years.

     

    But are you saying the temps never get above 60° C?

  • BDAqua Level 10 Level 10 (114,670 points)
  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    May 20, 2012 10:54 AM (in response to eye)

    Sorry to hear, sounds like the Power Supply at the moment.

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