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Mac Thread, power mac g5 refuses to start in Technical; hi i have a power mac g5 and it has been intermitent for a while some times it will load ...
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    robertsenior's Avatar
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    power mac g5 refuses to start

    hi
    i have a power mac g5 and it has been intermitent for a while

    some times it will load most of the time it wont

    when i press the power button the white led above the button flashes and there is a faint clicking noise.

    also when i remove all power and then try it again there is a quick red flash after the button is pressed.

    can any one help me

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    Have you checked the internals?
    check to see if the liquid cooling system is leaking.

    Hope that it is and hope that the next bit is true.

    There was a rumor i read (macrumors i think it was) that Apple are replacing powermac g5's with mac pros due to a problem with leaking liquid cooling systems.

    How true that is i don't know, but i'm hoping that it is and my G5 develops that specific fault

    Other things to try. Turn the machine on and hold down the cmd, shift and P and R keys on your keyboard.

    Try reseating the battery on board the mainboard.

    Remove any other devices inside the machine i.e. pci cards, additional HDDs etc. Re-seat all the fans in the machine to make sure that they are snug etc.

    Start in verbose by holding down cmd and V keys.

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    Sounds like it could be a faulty power supply.

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    robertsenior's Avatar
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    thanks ill try all that

    if it is the power supply then how do i go bout replacing it or is it not worth it

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    I replaced the power supply in mine, it was about 270 for a refurbished power supply in exchange for my broken one. To actually fit you have to remove pretty much everything except the logic board and it's still pretty tight. I think I took an entire morning just to remove my old one, for rebuilding it I managed to get the official take-apart instructions which gives you information that might be critical e.g. the order that you tighten the screws to secure the liquid cooling system to make sure it's contacting properly.

    I wouldn't be entirely convinced it was the power supply, mine actually exploded when I switched on at the wall socket so I was pretty sure.

    Apparently there are two different models of liquid cooler, one being more prone to leaks, this is the one that I have but it has been fine so far. I doubt Apple would give out Mac Pros as a replacement unit, there are so many problems with the late G5s regarding power supplies (exploding and squealing), fan speeds, firewire controller, cpu power management, the list goes on...

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