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Start up issue + "You need to re-start your computer"

1439 Views 9 Replies Latest reply: Feb 19, 2012 7:20 AM by paoloj RSS
paoloj Calculating status...
Currently Being Moderated
Feb 12, 2012 3:01 PM



On my iMac 2 GHz PPC G5, I have problems when starting up. I sometime need to start up again because it freezes on the blue screen. Sometimes it starts up just fine but then the screen goes all dark and I get the "You need to restart your computer" message.


I tried to repair authorizations and everything looked fine.


Sometimes it's just OK and I can use my dear iMac for several hours...


I did so much with this machine... how sad if it dies now !


Is there anything I can do ?


Thank you.

iMac, Mac OS X (10.4.10), 2 Ghz PPC G 5 - 1 Go DDR SDRRAM
  • Klaus1 Level 8 Level 8 (43,375 points)
    Currently Being Moderated
    Feb 12, 2012 3:19 PM (in response to paoloj)

    You are having 'kernel panics', usually hardware related, often caused by faulty RAM.


    What is a Kernel Panic?






    More details here:



    Useful article on how to avoid and eliminate kernel panics here:


  • Klaus1 Level 8 Level 8 (43,375 points)
    Currently Being Moderated
    Feb 14, 2012 4:01 PM (in response to paoloj)

    I usually start up better with Command + Option + P + R

    That is resetting the Pram. Try these as well:


    Resetting the SMU on a G5 iMac:



    and on resetting the PMU on a Power Mac G5, G4 and G3 :




    I cannot run the Apple Hardware test, because my dvd driver doesn't play dvds anymore

    That's bad news, because it will prevent you from repairing the hard drive properly, but try these as well:


    Repairing permissions is important, and should always be carried out both before and after any software installation or update.


    Go to Disk Utility (this is in your Utilities Folder in your Application folder) and click on the icon of your hard disk (not the one with all the numbers).


    In First Aid, click on Repair Permissions.


    This only takes a minute or two in Tiger, but much longer in Later versions of OS X.


    Background information here:



    and here:



    An article on troubleshooting Permissions can be found here:



    By the way, you can ignore any messages about SUID or ACL file permissions, as explained here:



    If you were having any serious problems with your Mac you might as well complete the exercise by repairing your hard disk as well. You cannot do this from the same start-up disk. Reboot from your install disk (holding down the C key). Once it opens, select your language, and then go to Disk Utility from the Utilities menu. Select your hard disk as before and click Repair.


    Once that is complete reboot again from your usual start-up disk.


    More useful reading here:


    Resolve startup issues and perform disk maintenance with Disk Utility and fsck



    For a full description of how to resolve Disk, Permission and Cache Corruption, you should read this FAQ from the X Lab:



    Apple's advice on general maintenance:


  • apple_lion Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 15, 2012 3:14 AM (in response to paoloj)


    i managed to get the i-books to work. I had to go to app purchase and check

    the status. After that the app miraculously appeared in my application



    I had to download OSX 10.7.2 to get it to work.


    Anyway thanks a lot for your help.


    I hope you have a good time in Penang. I am in Kuala Lumpur about 350 KM

    South of Penang.




  • Klaus1 Level 8 Level 8 (43,375 points)
    Currently Being Moderated
    Feb 15, 2012 3:42 PM (in response to paoloj)

    But then I opened Firefox and it crashed


    Which version of Firefox? The laest versions do not support Tiger or any PPC Mac. An alternative version called TenFourFox does.


    You can download TenFourFoxG5 from here:



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