Skip navigation

iMac G5 can't boot up!

689 Views 5 Replies Latest reply: Oct 31, 2012 8:36 PM by Lionel Poincenot RSS
Lionel Poincenot Calculating status...
Currently Being Moderated
Nov 18, 2011 6:48 AM

iMac G5 2GHz ALS can't boot up.  It was getting stuck on the gray screen with the apple logo and the fan going after a minute, or on the same screen with the spinning wheel.

I tried to erase the HD and reload the OS with the original DVDs (10.4).  First, the HD wouldn't appear either when trying to load the OS or in Disk Utililty.  After several start from the DVD, the HD appeared and I loaded the OS and all the OS updates.  That didn't change.

I then changed the HD and redid the OS loading (including all the updates) but now it won't even reach the screen with the apple logo and the fan starts after a minute.

I reset the SMU, PRAM.

When I was able to boot up, I loaded TechTool 3.1 and ran it (skipping the HD surface scan) and everything passed!

I can still start with the DVD but can't see the HD again in Disk Utility...

What can I try next?

Thank you.

iMac, Mac OS X (10.4.11), G5 20"/2.0GHz
  • MGW Level 7 Level 7 (26,940 points)
    Currently Being Moderated
    Nov 18, 2011 7:13 AM (in response to Lionel Poincenot)

    You have been very thorough - when you had the back off, did you check the appearance of the caps?  They should be perfectly flat with no exudate.

    Since TT showed nothing, try booting from the install disc and run Apple Hardware Test, see what that throws up.  You might also want to use



    Disk Utility


       1. Insert the Mac OS X Install disc that came with your computer, 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. (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. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.

       5. Select your Mac OS X volume.

       6. Click Repair. Disk Utility checks and repairs the disk.

    Then reboot from your internal (if you can) and repair permissions.





  • MGW Level 7 Level 7 (26,940 points)
    Currently Being Moderated
    Nov 18, 2011 7:38 AM (in response to Lionel Poincenot)

    SInce it doesn't show in DU, it would sem that the hdd is either faulty or improperly connected.  Does it have jumpers?  Are they properly connected?                        









More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.