MyPowePC G4 does not start

Discussion in 'PowerPC Macs' started by hewler, Jul 4, 2010.

  1. macrumors newbie

    Joined:
    Jul 4, 2010
    #1
    Yesterday I pulled out the power cable for my g4 by mistake and it shut down. After that, I can not start my computer. Nothing happens when I press the power button. No sound comes from the computer and it does not smell burnt. What can I do? Please help me!
     
  2. macrumors 68040

    DewGuy1999

    Joined:
    Jan 25, 2009
    #2
    Are you sure you got the power cable plug put completely back in?
     
  3. thread starter macrumors newbie

    Joined:
    Jul 4, 2010
    #3
    Yes I am sure. I have tried many times.
     
  4. macrumors newbie

    Damnations!

    Joined:
    Jun 5, 2010
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    Yes
    #4
    Seeing as it doesn't smell burnt, I think we can rule out fire, serious overheating, and burning.
    Are you sure you're pressing the on button? I remember when I got my first Mac. I couldn't find the power button for the life in me. Turns out I was holding it upside down.
     
  5. thread starter macrumors newbie

    Joined:
    Jul 4, 2010
    #5
    Thanx a lot for your answer. I have used this computer for a few years now. There is no problem with the power button. Exactly like before.
     
  6. macrumors 68000

    Hrududu

    Joined:
    Jul 25, 2008
    Location:
    Wichita KS
    #6
    What kind of Mac is it? Powermac, Powerbook, iBook, iMac?
     
  7. thread starter macrumors newbie

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    Jul 4, 2010
    #7
    It is Power Mac G4 2 x 1 GHz with OSX 10.5.
     
  8. macrumors 6502

    Joined:
    Mar 6, 2009
    #8
    Have you tried looking inside the unit for any signs of physical damage to the PSU?
    Do you have a spare AC cable? Perhaps a wire broke when it was pulled out.
    Or perhaps the fuse has blown in your plug socket?
     
  9. macrumors 68040

    DewGuy1999

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    Jan 25, 2009
  10. thread starter macrumors newbie

    Joined:
    Jul 4, 2010
    #10
    mrchinchilla: I can't find anything broken in the computer. I have tried with different cabels. Same result.

    DewGuy1999: I have tried the instructions in the given link. But the problem is there is no reaction at all when I press the power button. Nothing happens. I am confused.
     
  11. macrumors 68040

    DewGuy1999

    Joined:
    Jan 25, 2009
    #11
    The only other thing that I can think of beside the obvious dead power supply is that maybe it needs a new PRAM battery. I can't explain how or why this would of coincided with the pulling of the plug, but sometimes things are just a coincidence.

    I have a Bondi Blue G3 iMac that behaved the same way when it's PRAM battery died, no advance warning, no wrong date and time, just suddenly dead. You can probably get one at Radio Shack and they're only $10-$15.
     
  12. macrumors 68000

    4JNA

    Joined:
    Feb 8, 2006
    Location:
    looking for trash files
    #12
    it's dead jim.

    really sounds like a dead power supply to me.

    if you don't get results from any of the other reset/battery links, you might look at replacing the power supply.

    if you don't want to spend the crazy money for an apple replacement, you can use a standard ATX $12 supply after moving a couple wires. long live the splice and electrical tape! :D

    best of luck with the repair.
     
  13. thread starter macrumors newbie

    Joined:
    Jul 4, 2010
    #13
    I bought a new battery. It did not solve the problem.
     
  14. macrumors 68040

    DewGuy1999

    Joined:
    Jan 25, 2009
    #14
    Try resetting the PMU now that the battery has been replaced....
     
  15. thread starter macrumors newbie

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    Jul 4, 2010
    #15
    I have tried. There is no reaction at all. :(
     
  16. thread starter macrumors newbie

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    Jul 4, 2010
    #16
    Do you know how I can test the power supply to make sure that it must be fixed? Then if I have to replace it...how can I do it?
     
  17. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #17
    From that what you wrote it could be PSU (like mentioned before) or simply front panel board. Remove fpb and inspect for visual damages.
    To test PSU, you can try ATX test trick:http://www.duxcw.com/faq/ps/ps4.htm
    But you need to determine which exactly pins you need to short-out. This vill be helpful: http://www.outofspec.com/frankenmac/wire.shtml If you don't feel skilled enough to do it, remove PSU and take it to nearest electronics shop/repair. Take with you this linked pinouts diagram, it should be no problem for them.
    If PSU will be working, it'll be front panel board.
     
  18. macrumors newbie

    Joined:
    Jun 8, 2010
    #18
    I know that with my G4, the power button can be hard to press enough to start the computer. Do you have any PCI cards? I'm not sure if that will help, but when I was trying to boot 10.4 on my G4, I took out my USB hub and it booted the DVD, whereas before, nothing would happen.
     
  19. macrumors 6502

    Joined:
    Mar 16, 2007
    #19
    Usually if a device goes bad, it won't spark when you plug it into the power outlet. Listen for a click when plugging the mac into the wall outlet. If it doesn't spark at all, it's most likely the PSU. If it still sparks, test the other parts first, but I wouldn't rule out a bad component in the PSU.
     

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