Help? Power Mac G3 Blue & White Freezing

Discussion in 'PowerPC Macs' started by Slix, Sep 28, 2014.

  1. Slix macrumors 6502a

    Slix

    Joined:
    Mar 24, 2010
    #1
    I recently obtained a 300 MHz Power Macintosh G3 from my grandparents, and so far, nothing has been done with this machine.

    It boots just fine to Mac OS 9.1, but soon after booting to the desktop, it freezes randomly, usually just by moving the cursor around the screen. I tried booting to the Mac OS 9.2.1 disc I have (recently installed it onto an iMac G3, so I know the disc works fine) and the same thing occurs; it freezes randomly after a minute or so. I tried removing the hard drive to see if it was maybe a bad drive, and while it doesn't freeze with the CD, I can't install it that way obviously. So, after putting in another hard drive to test that one, the same thing occurs, freezes upon booting to the CD. I also tried removing the RAM and trying a stick I know is good, thinking one of the RAM sticks were bad, but no luck either.

    Another thing that would make this a load easier to troubleshoot, I can't boot this thing by holding Option for the boot options, or T for Target Disk Mode, so I could install OS 9 onto it from another Mac. Any reason why holding T or Option does nothing here?


    Thanks for the help in advance, I hope someone out there is able to assist me in some way! If not, I didn't lose anything by getting this machine, so it wouldn't be the worst if it's truly dead, but it'd be cool to have yet another Mac in my collection. :)
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    B&W G3's do not have Target Disc Mode. The first PowerMac to have that was the Sawtooth. Have you tried booting it with extensions off? Press the power button then press and hold the shift key until you see it say extensions off.
     
  3. gavinstubbs09 macrumors 65816

    gavinstubbs09

    Joined:
    Feb 17, 2013
    Location:
    NorCal boonies ~~~by Reno sorta
    #3
    My 400MHz loved to overheat and freeze up. I put a fan on the heatsink and wired it up. Never had an issue after that!
     
  4. Slix thread starter macrumors 6502a

    Slix

    Joined:
    Mar 24, 2010
    #4
    Dang! I thought it did have Target Disk Mode... Thanks for the info!

    I did try it with extensions off, same thing occurs.
     
  5. Altemose macrumors G3

    Altemose

    Joined:
    Mar 26, 2013
    Location:
    Elkton, Maryland
    #5
    Sounds to me like it is overheating as Gavin said.
     
  6. DZ/015 macrumors 6502a

    DZ/015

    Joined:
    Mar 23, 2003
    Location:
    New England
    #6
    Is the hard drive on the internal ata bus or is it scsi? The rev. 1 B&W units had a questionable hard drive controller chip on the logic board. There were issues with aftermarket/large/slave drives. Though I don't recall a problem with system lockup. There is a pic on this page to identify the chip. Other good B&W info there as well.
     
  7. Slix thread starter macrumors 6502a

    Slix

    Joined:
    Mar 24, 2010
    #7
    The drive is an ATA drive, I believe. The chip is the one listed on that page you listed, ending in 402.

    I don't think it's overheating, the system runs really cool and it freezes after being on for only a few minutes.
     
  8. bunnspecial macrumors 603

    bunnspecial

    Joined:
    May 3, 2014
    Location:
    Kentucky
    #8
    If it's all OEM, I don't see an issue, but just tossing this out there...

    I recently acquired one of these, and it booted and ran fine but the optical drive was dead. The first replacement that I used caused symptoms pretty similar to what you're describing.

    Try disconnecting the secondary ATA bus at the logic board(just pull the cable) and see if it gets you anywhere. From what you're describing, I sort of doubt that's the problem, but it's easy enough to do that I'd probably try it anyway.
     
  9. havokalien macrumors 6502a

    havokalien

    Joined:
    Apr 27, 2006
    Location:
    Kelso, Wa
    #9
    thermal paste

    I suggest removing the heat sink, remove old crusty paste and reapply (a lot less than you see on it) then put it back together.

    After 15 years that stuff does not conduct much heat and the air gap could be causing the freeze also. I suggest pulling the dead PRAM battery also on the motherboard as its probably freaking out there also.

    Dust removal would not hurt either.
     
  10. MysticCow macrumors 6502a

    MysticCow

    Joined:
    May 27, 2013
    #10
    As a side note, why does Apple insist on going nuts with thermal paste? It's even in their more current models and it looks like an "adult film stud" went all over it.
     
  11. Slix thread starter macrumors 6502a

    Slix

    Joined:
    Mar 24, 2010
    #11
    Not to sound stupid, since I'm generally not a hardware guy, but where exactly is the cable connected (secondary ATA bus at the logic board, as you said, bunnspecial) for the optical drive? Couldn't seem to find the right cable. :p

    And I checked the heatsink, looks like it's fine, nice and clean underneath it already.
     
  12. Altemose macrumors G3

    Altemose

    Joined:
    Mar 26, 2013
    Location:
    Elkton, Maryland
    #12

    The ATA cable is the one that goes to the optical drive. Since you pulled the heat sink off you should have cleaned and reapplied the paste as now there is air and what not.
     
  13. bunnspecial macrumors 603

    bunnspecial

    Joined:
    May 3, 2014
    Location:
    Kentucky
    #13
    As they say, a picture is worth a thousand words.
     

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  14. 128keaton macrumors 68020

    128keaton

    Joined:
    Jan 13, 2013
    #14
    Nice find, I've really wanted a B&W g3 for a while, saw one on craigslist, but it sold quickly. I'd replace the thermal paste, buy a new PRAM battery, and throw a quieter HDD in there.
     
  15. gavinstubbs09 macrumors 65816

    gavinstubbs09

    Joined:
    Feb 17, 2013
    Location:
    NorCal boonies ~~~by Reno sorta
    #15
    Mine was always beater. Pieces missing and case cracked in a few places. But still awesome nonetheless, mines packing a 450MHz G4 and a Radeon 9200 128MB!
     

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