8 Replies Latest reply: Jan 17, 2013 1:53 AM by japamac Branched to a new discussion.
t-john Level 1 Level 1 (0 points)

I've been running this G5 Mac Pro since purchasing it in 2005 with pretty much zero issues. A couple days ago while I was using it there was a fizzle, my display went black and the computer went quiet. I just figured a breaker had dropped since we have that happen occasionally. But no, all electricity was fine, the computer had just stopped. Trying everything obvious (different outlet, etc) did not help. Most of the discussions in the forum seem to be about computers that won't boot. Mine won't start at all.

 

When I plug in power / unplug power I can hear a small click - just once.

The small white light above the power switch also flashes just once.

If I take off the side panel and plastic shield I hear the same click but now of course the yellow led comes on. (If I understand things right, that light indicates not only that the plastic shield is not in place... but that the computer is correctly hooked up to an external power source).

No fans, no disks, nothing.... just that one click.

 

A call to support here in apple support / JAPAN tells me only that since this is now a vintage model, they can't offer any service. I mistakenly thought that they were referring to a service warranty not being in place... no, they actually have no one who will even look at it. Really???

 

Thanks in advance for any ideas.


Mac Pro, Mac OS X (10.5.8), G5 late 2005 model (Power PC)
  • 1. Re: Power up problems with G5 Mac Pro (Power PC)
    japamac Level 7 Level 7 (24,390 points)

    while I was using it there was a fizzle

    An electrical noise from inside the machine?

     

    Sounds as if your PSU has failed. Other than the remote chance of finding a shop that will work on it, you are likely left to repairing the machine yourself; ie, replacing the PSU.

     

    First, one would want to test the PSU with a volt meter to verify what is exibited- no power.

  • 2. Re: Power up problems with G5 Mac Pro (Power PC)
    japamac Level 7 Level 7 (24,390 points)

    no, they actually have no one who will even look at it. Really???

    Really.

  • 3. Re: Power up problems with G5 Mac Pro (Power PC)
    t-john Level 1 Level 1 (0 points)

    Thanks for the reply japamac. I believe you helped me get my PowerMac G4 back up and running back in 2008. I'm happily using that machine again now as I futz with the G5

     

    How would I find / test the PSU?

    Would a replaceable part be available (to purchase new?) if it turns out to be the problem... or would one look around for a "parts G5"?

    Thanks for patience with a novice repair person.

  • 4. Re: Power up problems with G5 Mac Pro (Power PC)
    t-john Level 1 Level 1 (0 points)

    Japamac..... just searched a bit and found a photo-detail description of removing the power supply on a G5. Wow. Also found several refurbished G5s through a place called GainSaver. Pretty sure they don't ship something that size to Japan for free. Anyway, back to checking the PSU. Is that tricky?

  • 5. Re: Power up problems with G5 Mac Pro (Power PC)
    Jacumba Level 4 Level 4 (2,325 points)

    Is that tricky you ask? If your an electronic engineer with a $400 dollar electronic volt meter probably not, that is what they cost to accurrately check a power supply, the testing unit cost more than a power supply. That is why you got > they actually have no one who will even look at it.

    It's a throw away and replace part. If you have a 10 year old TV would you take it to a repair shop with sophisticated test equipment, they don't exsist.

    Your best bet is to purchase a older G5 on craigslist for parts to swap out you can get them cheap.

  • 6. Re: Power up problems with G5 Mac Pro (Power PC)
    t-john Level 1 Level 1 (0 points)

    Thanks Jacumba. Yeah, there seem to be lots of used G5s out there. I'll keep poking around and probably try swapping out the power units before I give up on it. It's been a great machine and I have no problem using older software...

  • 7. Re: Power up problems with G5 Mac Pro (Power PC)
    Jacumba Level 4 Level 4 (2,325 points)

    Absolutely thats exactly how it works. If you brought your computer to a shop they swap out hardware, not test it.

    If your computer screen was getting distorted video this forum would tell you that the video card was bad and where to buy one.

    What you'd do is plug into another monitor that you know works. Then a shop knows if it's the monitor or video card, that way they can determine on the best way to screw you.

    If the computer works with another monitor then they know the monitor is good, the video card has to be good, but sell you one anyway. Could have been just the driver.

     

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  • 8. Re: Power up problems with G5 Mac Pro (Power PC)
    japamac Level 7 Level 7 (24,390 points)

    Japamac..... just searched a bit and found a photo-detail description of removing the power supply on a G5. Wow.

    The disassembly is involved. It does require no fear, manual dexterity, knowledge of machine assembly and the Apple Service Source manual helps.

     

    Testing is done with the PSU still in the machine using a multimeter that can be purchased at a home center (not too expensive, ¥2000 or so, as determining if DC voltage is present and within range is all that is needed).

     

    If you are interested, email me and I will email you a test instruction sheet pdf.