G4 Tower Power Supply dead

Discussion in 'PowerPC Macs' started by LisaJ, May 19, 2010.

  1. LisaJ macrumors newbie

    May 19, 2010
    Have a Power Mac G4 MDD - Apple genius bar looked at it and told me probably need a new power supply (shutting down at will and having trouble powering up but before that the computer was running well) and I'm not sure if I should get a used or new one on ebay or if you have a better idea. Can't afford a whole new system so want to resurrect this one. What issues does anyone expect I'll have and is there any advice? Thank you!
  2. max¥¥ macrumors 6502a

    Aug 7, 2008
    Over there....
    you could mod a cheap pc psu to run the mac, google it
  3. quantum003 macrumors 6502a


    Apr 27, 2009
    Hi there,

    buying a replacement power supply for an Apple computer will be expensive... everything that's marketed as "for Apple" is crazy expensive... but as the other poster said you can alter a PC power supply to do the same job for very cheap.

    In a PC, the front panel power on switch, reset, speaker, etc. all plug in directly to the logic board and get their power from there. However on a G4 tower like yours, the power supply connects to those devices instead and there are no inputs on the motherboard to do those things. So, you would need a power supply adapter that will turn a 4-pin molex (like this guy here)-


    into something with the same number of pins that will interface with the wiring from the power-on switch and other goodies from the front of your G4. Other than that a $40 PSU for a PC will work just fine for your purposes.
  4. 666sheep macrumors 68040


    Dec 7, 2009

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