9 Replies Latest reply: Feb 19, 2012 7:20 AM by paoloj
paoloj Level 1 Level 1 (0 points)

Hi,

 

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 (46,945 points)

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

     

    What is a Kernel Panic?

     

    http://support.apple.com/kb/TS3742

     

    and

     

    http://developer.apple.com/mac/library/technotes/tn2002/tn2063.html

     

    More details here:

     

    http://www.thexlab.com/faqs/kernelpanics.html

     

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

     

    http://reviews.cnet.com/8301-13727_7-10344626-263.html?tag=mfiredir

  • paoloj Level 1 Level 1 (0 points)

    Thanks Klaus for all the links and info.

     

    Here is an update:

     

    - After a couple of times trying, I usually succeed in starting up.

    - I cannot boot in Safe Mode. When holding the shift key, it sometimes starts up, but it doesn't indicate that it is in safe mode.

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

     

    - I cannot run the Apple Hardware test, because my dvd driver doesn't play dvds anymore (this occured before the Kernel Panic).

     

    - I runned all the test from TechTool Pro 6 (2h30 of tests) and runned the RAM test again (90 min). All tests are OK.

     

    - My room temperature in the morning is between 10 and 15 Celcius. Not sure if this could affect the RAM and start up ?

     

    Any suggestion would be great at this point, thank you

     

    Here is the last Panic Log:

     

    Mon Feb 13 19:43:32 2012

     

    Unresolved kernel trap(cpu 0): 0x600 - Alignment DAR=0x0000000002631623 PC=0x00000000000A41C0

    Latest crash info for cpu 0:

       Exception state (sv=0x41A50780)

          PC=0x000A41C0; MSR=0x00009030; DAR=0x02631623; DSISR=0x42000000; LR=0x0001DEAC; R1=0x1781BC10; XCP=0x00000018 (0x600 - Alignment)

          Backtrace:

    0x0001DE68 0x0001EB94 0x000241B8 0x0002407C 0x000496E0 0x0002921C

             0x000233F8 0x000ABCAC 0x33323037

             backtrace terminated - frame not mapped or invalid: 0xBFFFF3E0

     

    Proceeding back via exception chain:

       Exception state (sv=0x41A50780)

          previously dumped as "Latest" state. skipping...

       Exception state (sv=0x41A44780)

          PC=0x9000B348; MSR=0x0200D030; DAR=0xE00EF000; DSISR=0x42000000; LR=0x9000B29C; R1=0xBFFFF3E0; XCP=0x00000030 (0xC00 - System call)

     

    Kernel version:

    Darwin Kernel Version 8.10.0: Wed May 23 16:50:59 PDT 2007; root:xnu-792.21.3~1/RELEASE_PPC

    panic(cpu 0 caller 0xFFFF0006): 0x600 - Alignment

    Latest stack backtrace for cpu 0:

          Backtrace:

             0x000952D8 0x000957F0 0x00026898 0x000A8004 0x000AB980

    Proceeding back via exception chain:

       Exception state (sv=0x41A50780)

          PC=0x000A41C0; MSR=0x00009030; DAR=0x02631623; DSISR=0x42000000; LR=0x0001DEAC; R1=0x1781BC10; XCP=0x00000018 (0x600 - Alignment)

          Backtrace:

    0x0001DE68 0x0001EB94 0x000241B8 0x0002407C 0x000496E0 0x0002921C

             0x000233F8 0x000ABCAC 0x33323037

             backtrace terminated - frame not mapped or invalid: 0xBFFFF3E0

     

       Exception state (sv=0x41A44780)

          PC=0x9000B348; MSR=0x0200D030; DAR=0xE00EF000; DSISR=0x42000000; LR=0x9000B29C; R1=0xBFFFF3E0; XCP=0x00000030 (0xC00 - System call)

     

    Kernel version:

    Darwin Kernel Version 8.10.0: Wed May 23 16:50:59 PDT 2007; root:xnu-792.21.3~1/RELEASE_PPC

     

    *********

  • Klaus1 Level 8 Level 8 (46,945 points)

    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:

     

    http://support.apple.com/kb/HT1767

     

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

     

    http://support.apple.com/kb/HT1939?viewlocale=en_US

     

    http://support.apple.com/kb/HT1436

     

    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:

     

    http://support.apple.com/kb/HT1452?viewlocale=en_US

     

    and here:

     

    http://docs.info.apple.com/article.html?artnum=302672

     

    An article on troubleshooting Permissions can be found here:

     

    http://support.apple.com/kb/HT2963

     

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

     

    http://support.apple.com/kb/TS1448?

     

    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

     

    http://support.apple.com/kb/TS1417?viewlocale=en_US

     

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

     

    http://www.thexlab.com/faqs/repairprocess.html

     

    Apple's advice on general maintenance:

     

    http://support.apple.com/kb/HT1147?viewlocale=en_US

  • apple_lion Level 1 Level 1 (0 points)

    Hi

    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

    folder.

     

    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.

     

    Regards

    apple_lion

  • paoloj Level 1 Level 1 (0 points)

    Here is what I did:

     

    Resetting the SMU.

     

    Repair permissions.

     

    (I cannot boot from the Install disk or do the Hardware Test because my optical drive doesn't play dvds anymore.)

     

    So I did use the fsck via single user mode start up, the volume is : OK.

     

    I cleaned up all Caches via OnyX

     

    After doing all this and a little more (a few OnyX options), my iMac started up 3 times with no issues. Then after 1 hour, I started up again, all good and fast. But then I opened Firefox and it crashed. A few seconds after: dark screen, "You need to restart...". Kernel Panic is back...

     

    Any idea?

  • Klaus1 Level 8 Level 8 (46,945 points)

    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:

     

    http://www.floodgap.com/software/tenfourfox/

  • paoloj Level 1 Level 1 (0 points)

    Thanks for the quick respons. No not the latest version. I use Firefox 3.6.26

     

    Anyway, I still have issues when starting up. After trying a few times, I can start up and use the iMac for hours (text, Photoshop, Firefox etc.)

     

    Any suggestion ?

  • paoloj Level 1 Level 1 (0 points)

    Does anyone has a suggestion of a last thing I could try before bringing my iMac for repair?

     

    Thanks.

  • paoloj Level 1 Level 1 (0 points)

    I cannot boot from the Install DVD / Apple Hardware test, because my optical drive isn't working.

     

    Is it possible to plug my iMac to another Mac and  boot to make the Apple Hardware test from the other Mac?

     

    Thanks.