PLEASE HELP My IMac G5 wont start up!

Discussion in 'PowerPC Macs' started by Denri, Jun 17, 2008.

  1. macrumors newbie

    Joined:
    Jun 11, 2008
    #1
    My IMac G5 wont start up and i checked and the power supply and logic board are both working fine. First it would just go to a blue screen when i started it up, so i put in my restore disc and went to disc utility and wiped the hard drive then tried to reinstall OS X but the installation got to 75% and then the computer just restarted and now when i try to turn it on it just stays black and i cant boot off the disc. PLEASE HELP
     
  2. macrumors member

    BamaDMD

    Joined:
    Aug 4, 2007
    Location:
    Where its way too hot.
    #2
    When you say black, do you mean like zero activity? No screen characters whatsoever?
     
  3. macrumors regular

    Joined:
    Jul 2, 2005
    #3
    Are you sure you installed using the correct install disc (e.g. a disc supplied with a macbook will not work on a MacPro to say nothing of a G5 iMac)? If you are using a generic install disc, one that was bought in a separate box, then you are OK.

    Are you sure you are trying to boot off the install disc and not your bad install? Try...
    1) Shut down computer (press and hold power for about a minute, this forces a shutdown)
    2) Turn on computer while holding down the C key (this will force the computer to boot off the install disc (assuming it is inserted into your CD/DVD slot).


    You can also try zapping your P-ram to see if that will unstick your computer.

    Also try to booting into safe mode

    If you are unable to boot off of the install disk, then chances are you are experiencing a hardware problem (e.g. bad ram, logic board etc.). Your can try removing the ram in your computer and replace it with a stick from a friends computer (thereby determining if your ram stick(s) are bad).
     
  4. macrumors newbie

    ximon

    Joined:
    Jun 18, 2008
    #4
    My iMac G5 (17", 2.0 Ghz, ALS) just died recently with similar symptoms.

    First it started crashing alot. Then it started crashing just after booting. I decided to reinstall but when I booted from the Leopard disk the installation got partway through and then hung every time. I booted from its original Tiger disk and the OS installed but the iMac would only boot to a blue screen afterwards.

    I took it apart and had a nose around and found a dead capacitor on the logic board (presumably part of the GPU since booting to a blue screen usually means a GPU problem).

    Price to fix it: €900.
    Price to replace it: €1000.

    Guess which one I'm gonna do?

    So anyway, have a poke around inside and look for 'sploding capacitors, they look a bit like popped popcorn kernels. Unfortunately, if you can't see any that doesn't necessarily mean that they're all good, but if you do find one or more at least you will know the cause of your problems.
     
  5. macrumors 6502a

    J@ffa

    Joined:
    Jul 21, 2002
    Location:
    Behind you!
    #5
    http://www.apple.com/support/imac/repairextensionprogram/

    Maybe this'll be relevant to you?
     
  6. macrumors newbie

    ximon

    Joined:
    Jun 18, 2008
    #6
  7. macrumors 601

    eXan

    Joined:
    Jan 10, 2005
    Location:
    Russia
    #7
    O_O threads like this make me worry for my iMac ALS!

    So far it's been working fine (except for the DVD drive not wanting to properly record some DVD-Rs)... *knock* *knock* *knock* :eek:
     
  8. macrumors newbie

    ximon

    Joined:
    Jun 18, 2008
    #8
    Yeah, mine stopped burning DVDs about a year ago. It would do everything else, just not DVD burning.

    Luckily you can replace the optical drive in these iMacs relatively easily, before mine died I was considering doing just that, I could have got a new drive for about €75.

    Seems like these problems might be common then, I thought I was just cursed! :D

    Does yours make enough fan noise to render iChat useless too?
     
  9. macrumors 601

    eXan

    Joined:
    Jan 10, 2005
    Location:
    Russia
    #9
    It doesn't burn properly only DVD-Rs though, DVD-RWs are fine lol. I use MacBook to burn them now anyway. :)

    I don't audio chat on iMac, but during voice recordings it does record the moving air noise. If I need to audio (or video) chat I use MacBook because it has iSight :)
     
  10. thread starter macrumors newbie

    Joined:
    Jun 11, 2008
    #10
    imac 17"

    yeah i have a 17" IMac G5
    my problem was exactly like ximon's except now it just doesnt show anything when i turn it on and i used the proper disc.
     
  11. macrumors P6

    IJ Reilly

    Joined:
    Jul 16, 2002
    Location:
    Palookaville
    #11
    You probably have a hardware issue of some sort. Reinstalling is very often a bad idea when the Mac has such an obviously catastrophic problem. Passing the hardware test is not very meaningful. You could try swapping out RAM if you've added any.
     
  12. macrumors 601

    eXan

    Joined:
    Jan 10, 2005
    Location:
    Russia
    #12
    There were 5 models of 17" iMac G5. Which one do you have?
     
  13. thread starter macrumors newbie

    Joined:
    Jun 11, 2008
    #13
    i looked around in my imac and i couldnt find any dead capacitors.
    and my imac is a 17"/2.0/512/super/56k/BT/AP
     
  14. macrumors newbie

    ximon

    Joined:
    Jun 18, 2008
    #14
    Ouch, that's the same as mine. I'm afraid it certainly seems like you have a dead logic board, ergo a dead iMac. An authorised service centre will be able to confirm this for you.
     
  15. macrumors 601

    eXan

    Joined:
    Jan 10, 2005
    Location:
    Russia
    #15
    O_O same model as mine!

    Now I'm even more worried :eek:
     
  16. thread starter macrumors newbie

    Joined:
    Jun 11, 2008
    #16
    damn, are you sure its the logic board? because i did the check thing where you take off the back and turn on the computer and if the light turns on it means the logic board is working
     
  17. macrumors P6

    IJ Reilly

    Joined:
    Jul 16, 2002
    Location:
    Palookaville
    #17
    "On" is not the same as "working."
     
  18. macrumors newbie

    ximon

    Joined:
    Jun 18, 2008
    #18
    Those little lights are about as much use as the Apple Hardware Test - both reported that all was well with my iMac in spite of my capacitor popcorn.
     
  19. thread starter macrumors newbie

    Joined:
    Jun 11, 2008
    #19
    damn
     
  20. macrumors regular

    dilbert4life

    Joined:
    Jun 23, 2008
    Location:
    Bolivia, according to my flag :P
    #20
    The real question is.....

    What are you going to do with your old machine then?

    From what I can understand from the previous posts, there is a relatively simple, although time consuming and very tedious, fix for your computer.

    Just replace the blown capacitors. (By the way, I only recently joined MacRumors, but that does not mean I am in any way a "newbie" when it comes to repairs and such. So please refrain from replies to this post with such useless rabble as "He doesn't know what he is talking about...Blah blah blah..:))

    I would be willing to fix it for you, or even buy it from you and thereby subsidize the price for your purchasing of a new machine.

    Let me know.:apple:
     

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