Go Back   MacRumors Forums > Apple Hardware > Desktops > iMac

Reply
 
Thread Tools Search this Thread Display Modes
Old Aug 31, 2011, 10:46 PM   #1
cocoatronik
macrumors newbie
 
Join Date: Sep 2008
Location: Minneapolis, MN
Unhappy G5 won't boot

I have a 2005 iMac G5 17" ALS (Ambient Light Sensor) that will not boot.

When I attempt to boot from the hard drive, the gray screen with the Apple logo and spinning icon appears, followed by the blue screen, and then it freezes with a spinning beach ball on the blue screen.

I've tried to boot from a CD/DVD, using both the original Tiger OS disk that came with the machine and the Leopard install disk that was used to upgrade it. When I try holding the Command key while booting, the startup manager opens, displaying the HD as an option. But when I insert the disk, it spins around for a while (with the cursor a timer icon), and eventually just ejects the disk without ever showing it as a boot option. Clicking on the refresh button does not help. When I try holding the C key while booting (with the disk already in the drive), it spins around while displaying the gray screen (without the Apple logo), and then ejects the disk. After ejecting, it attempts to boot from the HD (gray Apple logo screen, followed by freezing on the blue screen).

Other details:
  • I've reset the SMU (by removing all cables, then reconnecting the power while holding down the power button).
  • I've reset the PRAM and NVRAM (using Command+Option+P+R).
  • I've switched the RAM modules.
  • I've tried unplugging all peripherals.
  • Internal diagnostic LEDs 1, 2, and 3 all indicate normal function.
What does it mean when it just ejects the CDs/DVDs like this? Does that indicate a logic board problem? What else can I try?

Last edited by cocoatronik; Aug 31, 2011 at 10:54 PM. Reason: Added detail.
cocoatronik is offline   0 Reply With Quote
Old Sep 14, 2011, 12:17 PM   #2
cocoatronik
Thread Starter
macrumors newbie
 
Join Date: Sep 2008
Location: Minneapolis, MN
Lost cause?

I'm gathering there is nothing left to try.

I'll wait a few more days to see if there are any suggestions. Otherwise, I'll pull out the HD and drop the machine off for recycling.

cocoatronik is offline   0 Reply With Quote
Old Sep 14, 2011, 12:40 PM   #3
jaikob
macrumors 6502
 
Join Date: Jul 2008
Location: Freeland, MI
Hold the command key and S while booting. This will take you to single user mode.

Can you get there?
__________________
iPad 2 64GB White , Mid 2011 iMac 3.4GHz i7 12GB Ram ATI 6970M 2GB Apple SSD + 1TB
jaikob is offline   0 Reply With Quote
Old Sep 14, 2011, 06:40 PM   #4
cocoatronik
Thread Starter
macrumors newbie
 
Join Date: Sep 2008
Location: Minneapolis, MN
Single-User Mode

Quote:
Originally Posted by jaikob View Post
Hold the command key and S while booting. This will take you to single user mode.

Can you get there?
Thanks for the response! Yes, I was able to enter single-user mode. Once there, I ran file checks using fsck -y, and then fsck -f, with the following results…

:/root# fsck -y
** /dev/rdiskOs3
** Root file system
** Checking Journaled HFS Plus volume.
fsck_hfs: Volume is journaled. No checking performed.
fsck_hfs: Use the -f option to force checking.

***** FILE SYSTEM WAS MODIFIED *****
:/ root# fsck -f
** /dev/rdiskOs3
** Root file system
** Checking Journaled HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
** Checking multi-linked files.
** Checking Catalog hierarchy.
** Checking Extended Attributes file.
** Checking volume bitmap.
** Checking volume information.
** The volume Macintosh HD appears to be OK.
:/ root#


(When I typed "exit," it eventually got to the blue screen, then faded to a black screen with a white vertical stripe down the middle third of the screen, where it hung up.)

I don't know what to look for, but one thing that stood out to me in single-user mode was a line...

AppleSMU -- shutdown cause = 3

Isn't AppleSMU the power management chip (Systems Management Unit)? Is this indicating a problem, or is that normal in this mode?

What else should I try or look for in single-user mode?

Last edited by cocoatronik; Sep 14, 2011 at 06:43 PM. Reason: Added detail for clarification.
cocoatronik is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Hardware > Desktops > iMac

Tags
booting problem, imac 2006, ppc

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
Ran Repair Disk on Boot Camp partition and Windows won't boot sneak3 Windows, Linux & Others on the Mac 0 May 26, 2014 08:22 AM
Macbook Pro (early 2008) won't boot, then booted, now won't boot again. ruyen MacBook Pro 12 Dec 21, 2013 06:27 PM
Why won't boot recovery mode? Won't start even from boot usb cicchilitto MacBook 2 Oct 19, 2013 04:17 PM
Bootcamp Windows Partition Won't Boot After Accidentally Changing Boot-up Partition JordanSimps Windows, Linux & Others on the Mac 2 Aug 13, 2013 11:00 AM
HELP! ML won't boot bursty OS X 10.8 Mountain Lion 12 Oct 4, 2012 09:53 PM

Forum Jump

All times are GMT -5. The time now is 08:38 AM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC