1 2 Previous Next 17 Replies Latest reply: Jun 9, 2012 3:50 AM by MONETAMAN
MONETAMAN Level 1 Level 1 (0 points)

      after removing logic board on my 20"imac g5 i sight to look at caps

         everything was fine, replaced my board. my led diagnostic light # 1

            goes on when plugged in. thats ok when pressing power button

              light #2 goes on but right off.jumps right to led #4 and 4 light

                stays red. ahy help appreciated. unit does not power up


PowerMac, Mac OS X (10.5.8)
  • 1. Re: imac g5. i sight led light
    Kenichi Watanabe Level 7 Level 7 (30,030 points)

    There must have been a reason you removed the logic board in the first place.  If so, what was that reason?  How was the iMac working before you removed the logic board?  If there was a problem of some type, can you describe the symptoms?

  • 2. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

                i was getting kernel panics, just wanted to check capacitors, also got notice to always

                   restart computer with the many languages box, folder with finder, flashing question mark

                       before logic board removal did everything possible to get it up and running. installed new hard drive

                         that went ok when it was running, did that after kernels appeared.

  • 3. Re: imac g5. i sight led light
    Kenichi Watanabe Level 7 Level 7 (30,030 points)

    You can try resetting the SMU (power management).  This is the procedure

     

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

     

    Be sure to disconnect all cables.  When attempting to power it up initially, there should not be anything connected, except the power cord.  If the iMac was plugged into an old or overcrowded power strip (surge suppressor) before, try connecting it directly to a wall outlet.

     

    A dead or weak PRAM battery can sometimes cause startup issues, although I don't think it would cause kernel panics.  Has it ever been changed?  When you unplugged the iMac from power to remove the logic board, any remaining charge in the battery may have completely drained.  The part looks like this

     

    http://eshop.macsales.com/item/Newer%20Technology/CR2032/

  • 4. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

            thanks for getting back, never changed battery, im pretty sure with this imac g5 i sight the logic board has to come out again to change this battery, correct???

  • 5. Re: imac g5. i sight led light
    Baby Boomer (USofA) Level 9 Level 9 (55,575 points)

    iMac G5 Take Apart Instructions

     

    We Love Macs!

     

    iFixit

     

    YouTube's "How To" tutorials.

     

    ===============

     

     

    The CR2032 battery can be purchased/ordered for under $10.00 from:  http://mac-batteries.com/

     

    SynapTECH is even cheaper - $1.00.

     

    CR2032

     

     

     

     

     

     

     

     

     

     

     

     

     

    /___sbsstatic___/migration-images/185/18574389-2.gif

  • 6. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

            replaced battery, when first powered up went to second led light green, looked like it was going to work

                 did not jump to 4th led light red as it did before, probably shoul have let it run its course but was

                    so happy i shut it off to replace some screws and put it all together, trid it again before closing

                       up went to 2nd green then right off and again jumped to 4th light red. red is overheat light

                          from what i understand, unit not on long enough for that to happen, still frustrated!!!!!!!!!

  • 7. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

            some of the codes i was getting prior to this

                       unable to find driver for this platform

                           darwin kernel version 9.1.0

                              mac os version not yet set

                                  panic cpu 0 caller  ox0036c4F8

                                                    all greek to me

  • 8. Re: imac g5. i sight led light
    Kenichi Watanabe Level 7 Level 7 (30,030 points)

    The only thing I can think of is to put it back into that somewhat disassembled state when it appeared to be working better.  If it actually does work better that way, try to figure out why.  Were any of the internal cabling disconnect in this state of assembly?  Did it actually start up all the way to the Desktop (or just get passed the lights)?

     

    If the "4th light red" is supposed to indicate overheating, perhaps a fan is being affected in some way when it gets more fully assembled.

     

    Oh...  I'm not sure if it actually gets to this point in the startup process, but if it does, you should try resetting PRAM, if you have not done so already AFTER replacing the PRAM battery.

     

    http://support.apple.com/kb/HT1379

  • 9. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

               done everything possible, cannot reset pram, does not stay on long enough.

                  sometimes indicator light goes on when i press the power button, sometimes not

                      its leading me to think its the power supply, but you cannot keep replacing parts

                         without testing them. would need pinout of the power supply my # 614-0363

                              if i might add, in the very beginning before kernel panics, it would freeze

  • 10. Re: imac g5. i sight led light
    Baby Boomer (USofA) Level 9 Level 9 (55,575 points)

    Except for RAM installation the iSight model PPC iMacs are not user repairable.  You would be better off taking it in to an Apple Store or your local AASP.

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

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  • 11. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

         its easy once you put your mind to it, they learned by a book anyway. back to my problem, i was able

            to get it up and running by pressing the reset button on the logic board. still getting restart your computer

              message with all the languages, plus i got a loud beep, now with a flashing power light and this

                                                               panic CPU 0 caller

                                                                     0x0036c4f8    unable to find driver for this platform

                            this is where i am at present

  • 12. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

           finally got to safe boot sign in but computer was laying down could not make mouse work

             up righted unit, now cannot get to safe boot again by holding shift key

               getting now unresolved panic

  • 13. Re: imac g5. i sight led light
    Baby Boomer (USofA) Level 9 Level 9 (55,575 points)

    Kernel panics are hardware problems which you already know you have.    Check out the following KB Articles:

     

    "You need to restart your computer" (kernel panic) message appears (Mac OS X v10.5, 10.6)

     

    User Tip:  Kernel Panics? Don't panic too!

     

     

     

     

     

     

     

     

     

     

     

     

     

     

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  • 14. Re: imac g5. i sight led light
    MONETAMAN Level 1 Level 1 (0 points)

               most of the time i cannot get to safe boot, just gave up again, gray screen apple logo, spinning

                  gear wheel, fans come on full force, back to message restart your computer, should i give up

                       something tells me its a simple fix?

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