Mac G5 freezing, fans go full speed

Discussion in 'PowerPC Macs' started by cb6293, Dec 6, 2018.

  1. cb6293 macrumors newbie

    Joined:
    Dec 6, 2018
    #1
    I am currently trying to boot Linux Mint onto a Mac G5 from a USB flash drive, but I can't get very far because within a minute of starting up, the screen freezes and the fans speed up a lot. Anybody have any idea why?
     
  2. AL1630 macrumors 6502

    AL1630

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    Apr 24, 2016
    Location:
    Idaho, USA
    #2
    Does it boot into any OS? (Is one installed on the hard drive?)
     
  3. Project Alice macrumors 6502a

    Project Alice

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    Jul 13, 2008
    Location:
    Post Falls, ID
    #3
    Could be a few things. Which G5 first off? Also, what he said:
    USB booting is sorta controversial on PPC macs. Sometimes it works, sometimes it doesn't. But, we do need a bit more info. Start with answering these and we can probably begin to figure this out.
     
  4. cb6293 thread starter macrumors newbie

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    Dec 6, 2018
    #4
    There is nothing on the hard drive. I put in the flash drive, go into open firmware and type "boot ud:,\\:tbxi" or something like that and it gives me a sector size mismatch error. If I don't go into open firmware, there is a little folder in the center of the screen that flashes from the Finder face and a question mark. Mouse and keyboard don't work in this situation. I will figure out what type of G5 it is shortly.
     
  5. AL1630 macrumors 6502

    AL1630

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    Apr 24, 2016
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    Idaho, USA
    #5
    Flashing folder means it couldn't find a bootable OS. Do you have any OS X cds or another mac with firewire?
     
  6. Dronecatcher macrumors 68030

    Dronecatcher

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    Lincolnshire, UK
    #6
    You might be better to try booting OSX from USB first, then at least you can check the machine out - Linux can bring it's own problems even if the boot process is fine.
     
  7. cb6293, Dec 7, 2018
    Last edited: Dec 7, 2018

    cb6293 thread starter macrumors newbie

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    Dec 6, 2018
    #7
    Ok, update. I have researched more and I found out that when I turn it on, before it freezes, a led comes up by one of the RAM banks labelled "overtemp." Shortly after, a led labelled "checkstop" lights up, and THEN the computer freezes, and soon after, the fans go crazy. I am currently trying to get a OS Cheetah disk going, but I want to fix the freeze problem first.

    EDIT: I learned that the checkstop happenes when there is a memory error, and it freezes all the system's clocks and attempts a full hardware reset, but that doesn't make sense, because I replaced all the memory.
     
  8. AphoticD macrumors 68000

    AphoticD

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    Feb 17, 2017
    Location:
    Australia
    #8
    Overtemp is normally just as it sounds - it’s running too hot. Renew the thermal paste on the CPU(s), clear any dust from the fans and grills. Check the fans are each operating okay and if it has a Liquid Cooling System, flush, clean and renew the coolant.
     
  9. cb6293 thread starter macrumors newbie

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    Dec 6, 2018
    #9
    What coolant would I use, and how would I flush it and renew it? I have found out that is is the cooling system, but I am at a loss of how to renew the coolant.
     
  10. eyoungren macrumors Core

    eyoungren

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    Aug 31, 2011
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    #10
    There is no way in hell you are going to ever get Cheetah installed, even if you fix this freezing problem.

    Like every Mac, the G5 requires a certain minimum OS. The earliest G5 requires a minimum of Jaguar 10.2.7. And your G5 is unlikely to be one of the first, so it probably needs an even higher version.
     
  11. RhianB, Dec 11, 2018
    Last edited: Dec 11, 2018

    RhianB macrumors 6502a

    RhianB

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    Sep 3, 2016
    Location:
    505 USA
    #11
    Distilled water works to refill a lcs but alotta folks use non corrosive engineered coolants like coolermaster nc-1 & the like.

    Everything said thus far is spot on to figure this out. Here’s a pretty decent discussion on g5 lcs maintenance, lcs flush & fill etc.

    https://discussions.apple.com/thread/3065982

    Best of luck. Let us know how you get on.
     
  12. AphoticD macrumors 68000

    AphoticD

    Joined:
    Feb 17, 2017
    Location:
    Australia
    #12
    Which model G5 do you have? There’s a sticker below the clear air deflector door with the model specs and serial number.

    Based on the description, it sounds like you have either a Dual Core 2.0GHz, 2.3GHz or a Quad Core 2.5GHz G5.

    As @eyoungren pointed out, Cheetah is a no go. You’ll want to either use either Leopard 10.5 (Retail) or a Tiger 10.4.4 Late 2005 Power Mac G5 system restore disc. You could also use the retail Tiger 10.4.7 (PowerPC) install disc.
     

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11 December 6, 2018