PowerMac G4 MDD won't start anymore!

Discussion in 'PowerPC Macs' started by AJKing, Jun 8, 2011.

  1. macrumors member

    AJKing

    Joined:
    Jan 24, 2008
    #1
    I've got a PowerMac G4 MDD (dual 867), slightly upgraded (2 additional hard-drives, 2gb RAM, lightscribe DVD drive) which was running 10.5.6 beautifully until this past Saturday. My girlfriend shut it down (we rarely do) during a storm and now it won't start back up! The power light turns on while pressing it but it quickly disappears. I've reset the PMU and still nothing.

    Any help? Thanks in advance.
     
  2. macrumors 65816

    adcx64

    Joined:
    Nov 17, 2008
    Location:
    Cudi Zone
  3. thread starter macrumors member

    AJKing

    Joined:
    Jan 24, 2008
    #3
    Is there a way I could check before replacing it?
     
  4. macrumors 6502

    Dave H

    Joined:
    Mar 2, 2008
    Location:
    California
    #4
    How old is the PRAM battery? They can cause strange problems when they die.
     
  5. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #5
    If you have a multimeter, you can check output voltages on PSU->logic board plug. Exactly that same as with PC ATX PSU.
     
  6. macrumors 6502

    MacintoshMaster

    Joined:
    Jan 16, 2010
    Location:
    Britain
    #6
    I think it could either be

    1. Bad Plug Socket (Due to the storm)
    2. Bad Power Pack
     
  7. macrumors regular

    #7
  8. thread starter macrumors member

    AJKing

    Joined:
    Jan 24, 2008
    #8
    It's the original battery, so 12 years old. I'll look into the multimeter, see if I can pick one up somewhere around here.
     
  9. macrumors 6502

    Dave H

    Joined:
    Mar 2, 2008
    Location:
    California
    #9
    They usually last 4-5 years. I'd suggest replacing it.
     
  10. macrumors 6502a

    bizzle

    Joined:
    Jun 29, 2008
    #10
    You must have went from 1999 into the future year of 2002 to purchase it and brought it back to 1999 if it's 12 years old.

    That machine will run with NO PRAM battery. It's most likely NOT the cause of your issue.
     
  11. macrumors 65816

    mabaker

    Joined:
    Jan 19, 2008
    #11
    Do try to replace the lil battery. My dual 800 didn’t want to start up properly and since I replaced it it is working a lot better with only sporadic acting up. :)
     
  12. thread starter macrumors member

    AJKing

    Joined:
    Jan 24, 2008
    #12
    These computers were sold in 2002 but a large amount of the hardware is dated 1999. If you've ever looked inside one you'd know.

    Thanks to everyone for the help. I'll replace the battery, see what happens. I'm thinking it's not the power supply since the power light still lights up. Just really hoping the logic board is okay.
     
  13. macrumors 6502a

    stroked

    Joined:
    May 3, 2010
    #13
    There are several circuits in a PSU. Just because a light comes on, doesn't mean your PSU isn't bad.
     

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