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  1. #1
    G3 Power Supply Problem.
    Hi all,

    it's my first post so play nice

    I've Been lucky enough to be given a B&W G3 (yosemite) but it was missing it's power supply. i've tried to use an ATX power supply, as seen here , but it doesn't boot. it does do the following:

    PSU fan starts
    Hard drive spins up
    Six LED's on the motherboard light up:
    DS4 + DS5

    Also the main case fan appears to be unplugged. it doesn't spin and the lead is unattached to anything. i can't find a connector on the motherboard to plug it into.

    I'd be really grateful for any assistance or just some links to more in depth pictures, diagrams, blueprints, spec sheets, etc. i've had a look at apple's developer notes but they don't really go into specifics. I've also tried googling around a bit but i must confess to feeling a bit lost as to where to start.

    again, thanks in advance for any help


    edited to add:

    I also tried holding down the reset switch next to the internal 'power on' button by DS8

  2. #2
    found a pretty complete manual here

    fixed the fan problem with a bodged - er i mean modded - molex/fan extension cable.

    also improved the PSU situation by using the spliced wiring from here which seems to make things more spec-compliant than just cutting the cables.

    also noticed that the caps-lock key on the USB keyboard flashes when it's powered up.

    have tried 3 different AGP monitors with no joy. also tried all the different reset procedures, like popping the battery out for 10 mins etc.

    stoopid question: will any AGP card work or do they have to be special Mac-compliant/certified ones?

    Thnx again


  3. #3

    macEfan's Avatar
    Member Since
    Dec 01, 2004
    Somewhere in the world
    Powermac g4 400mhz, 10gb, 256mb ram, OS9
    First of all, the g3 B&W doesn't even have an AGP slot... its PCI...

    Secondly, you need a mac-specific card...unless you flash a PC card, but Im not sure how to do that...
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  4. #4
    I've been doing more tinkering to no effect on the machine but of great use to my learning curve

    thnxs for the reply macEfan

    > the g3 B&W doesn't even have an AGP slot... its PCI...

    it's sort of PCI. there's notches in the card and the gfx slot has, er, wha'd'ya'call'em's to match. i guess i meant that it's the VGA port type as well as opposed to a mac video port

    > flashing a PCI card

    sod that for a game of soldiers.

    at the moment i suspect either the proc or the video card. anyone know what the LED's on the mobo mean?

    the plan now is to wait until another G3 falls outta the sky. oh well...


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