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iMac G5 Boots To Blank Blue Screen

7874 Views 13 Replies Latest reply: Apr 18, 2011 7:46 PM by xXmatt69Xx1 RSS
xXmatt69Xx1 Level 1 Level 1 (60 points)
Currently Being Moderated
Mar 6, 2011 11:13 AM
Hello,

My name Is Matt and i've had my iMac G5 for about a half a year now and only a couple minor things went wrong that i fixed with a couple steps. But I can't seem to fix this one. So one day i turned on my iMac and It booted up fine. But i noticed when i was done using it It would hang on the shutdown and I couldn't turn It off other than holding the power button. Then things got worse. I then turned it on later the next day and when I logged onto my user i had NO icons on the top left menu bar (Spotlight, Sound, Wifi, etc.), I couldn't log off i couldn't open Finder, I couldn't do anything. So i held the power button until it turned off and when i turned it back on the gray Apple logo came up and the pinwheel came up (Like Usual) but then It went to a blank blue screen. All you could see was the mouse. And sometimes instead of a mouse you see a spinning beach ball. This never happened to me before and i never updated or installed anything before this happened. I have been on 10.5.8 since I had my iMac...

Any suggestions please?

Specs:

- iMac G5 17" Ambient Light Sensor
- Mac OS X (10.5.8)
- iMac G5 17" Ambient Light Sensor | 148.93 GB | 2GHz PowerPC G5 Processor | 1GB DDR SDRAM | Build 9L31a | Version 10.5.8
iMac G5 17" Ambient Light Sensor, Mac OS X (10.5.8), iMac G5 17" Ambient Light Sensor | 148.93 GB | 2GHz PowerPC G5 Processor | 1GB DDR SDRAM | Build 9L31a | Version 10.5.8
  • MGW Level 7 Level 7 (26,940 points)
    Currently Being Moderated
    Mar 6, 2011 12:07 PM (in response to xXmatt69Xx1)
    Welcome to Discussions Matt - thanks for posting all your details, it saves a lot of time.

    Try resetting both the PRAM and then the SMU:


    1. Shut down the computer.
    2. Unplug the computer's power cord.
    3. Press and hold the power button for 5 seconds.
    4. Release the power button.
    5. Attach the computers power cable.
    6. Press the power button to turn on the computer.

    Once you've done that, go to Disk Utility and repair Permissions.




    Please post back with results,





    Photobucket
    27" i5 8 GB RAM, 21" iMac, 4GB RAM, 13" MBP 500GB, 4GB RAM, 1TB OWC quad drive,, Mac OS X (10.6.6), 15" G4 iMac, 15"iMac G3 DVD, 500GB Quad OWC HD and my beloved Cube
  • MGW Level 7 Level 7 (26,940 points)
    Currently Being Moderated
    Mar 9, 2011 1:13 PM (in response to xXmatt69Xx1)
    That would seem to suggest that your logic board has failed. I'm afraid it's time to take it in and have it looked at by a tech. However, since you have the Ambient Light, try opening the back and look for swollen or leaking caps (little soda cans), their tops should be perfectly flat. If they are not, you have found your problem, they need to be replaced.





    Photobucket
    27" i5 8 GB RAM, 21" iMac, 4GB RAM, 13" MBP 500GB, 4GB RAM, 1TB OWC quad drive,, Mac OS X (10.6.6), 15" G4 iMac, 15"iMac G3 DVD, 500GB Quad OWC HD and my beloved Cube
  • arnie Level 5 Level 5 (4,065 points)
    Currently Being Moderated
    Mar 12, 2011 3:15 PM (in response to xXmatt69Xx1)
    as a guess, your hard drive maybe failing, see if you can boot from the OS disc and run the drive test
    Windows XP Pro, Dell D620, MBP 15" 2.16GHz, 10.6
  • jeffreystern Calculating status...
    Currently Being Moderated
    Mar 16, 2011 5:25 AM (in response to xXmatt69Xx1)
    Having the same problem with a friend's G5. She said she had installed iWork 08 and right after that her iMac started operating very slowly. I had her start up in Safe mode and that worked for a day, but now I can't even get it to start in safe mode. it also won't boot from any disk, Leopard disk, DiskWarrior, or original G5 disks. Have hooked it to one of my old iMacs through firewire (target disk mode) and can access the hard drive just fine. Ran DiskWarrior and used Drive Genius to repair permissions, but still no go. Also started in single user mode and ran fsck -y a couple of times until it said everything was fine, but still can only get to the blue screen. (note also deleted and removed all parts of iWork 08).

    Her iMac was one of the ones that had the logic board problems and she had a replacement board put in about 1 year ago. Could this be a logic board issue again? is there anyway to test for this remotely (as in through target disk mode since I can't seem to get into it any other way).

    Thanks

    Jeff
    Mac OS X (10.5.8)
  • arnie Level 5 Level 5 (4,065 points)
    Currently Being Moderated
    Mar 20, 2011 8:14 AM (in response to xXmatt69Xx1)
    if it freezes when booting from the install disc, it's likely a hardware problem since any software on the computer is bypassed.

    could be different things - RAM, hard drive, possibly the logic board.

    at this point it probably needs to be opened up to examine the logic board or maybe swap the hard drive to test.

    if it's a hard drive, the fix is not so bad, failed logic board is not worthwhile replacing.
    Windows XP Pro, Dell D620, MBP 15" 2.16GHz, 10.6
  • arnie Level 5 Level 5 (4,065 points)
    Currently Being Moderated
    Apr 14, 2011 5:41 PM (in response to xXmatt69Xx1)
    thanks for the update, keep in mind that the voltages can be dangerous around power supply area, if you decide to disassemble iMac.
    Windows XP Pro, Dell D620, MBP 15" 2.16GHz, 10.6
  • prosurfer93 Calculating status...
    Currently Being Moderated
    Apr 18, 2011 6:57 PM (in response to xXmatt69Xx1)

    matt try jholding the opt key on start up till it goes to a screen that will show a hardrive i a square wait for the square to finish loading then click it to boot into os x it might work i have a g5 and have had the same problem and this works every time

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