iMac G4 won't boot, fan twitches

Discussion in 'PowerPC Macs' started by Oblak, Apr 22, 2018.

  1. Oblak macrumors newbie

    Joined:
    Oct 16, 2016
    #1
    Alright guys, so I'm having some troubles with an old flowerpot iMac. About a month ago I knocked a glass of water on the desk where the computer is sitting. There was no splash to speak of, the water just spilled around the base of the iMac. I immediately pulled the plug, but didn't feel like doing much else, as it was 3AM. Anyway, I left it like that for over a week before plugging it back in and trying to turn it on. Well, it didn't boot. I was kind of surprised because it was a relatively small amount of water and I didn't think it would get inside from under the base.

    Now, I'm far from an expert, so I did some Googling and tried resetting the PRAM on the switch on the motherboard to no avail. I also checked the CMOS battery, which seems to still have some charge in it. Today, I decided to take apart the iMac for the heck of it. I cleaned it to the best of my capabilities and reseated the RAM. Tried turning it on while it was taken apart and noticed that the fan twitches when I plug it into an outlet. Nothing happens when pressing the power button. I don't see any blown capacitors on the motherboard or psu. I tried turning it on without the HDD and optical drive connected, just in case, and again the fan twitched when I plugged it in.

    Any help is appreciated!
     
  2. CooperBox macrumors 6502a

    CooperBox

    Joined:
    Nov 28, 2010
    Location:
    France - between Ricard & Absinthe
    #2
    Not sure if I can really help you here.
    Imho any water spilling around the base of a 'Sunflower' iMac could fairly easily enter any one of the many cooling inlet holes, situated only 6mm or so above the base itself. That could easily occur if any spillage started to 'pool'. If this was the case, opening and peering inside on top of the logic board, one would not necessarily see any evidence of spillage or signs of oxydation. Any untoward signs would have to be viewed on the underside of the logic board, which would mean its removal in order to check. A relatively simple additional task if you have already opened the base unit itself.
    Simple question follows. What's a 'flowerpot' iMac......:rolleyes:
     
  3. Oblak thread starter macrumors newbie

    Joined:
    Oct 16, 2016
    #3
    Lol, my bad! Anyway, the underside of the board looks fine to me, here's a Google Photos album with some pictures: https://photos.app.goo.gl/TiF1wUOPPoC3OIVs1

    I changed the PRAM battery just in case, but no luck.
     
  4. CooperBox macrumors 6502a

    CooperBox

    Joined:
    Nov 28, 2010
    Location:
    France - between Ricard & Absinthe
    #4
    Looks like something more serious in that case.
    As troubleshooting is not my forte, I will leave it to those brighter than myself to offer suggestions.
    I guess you've read THIS iFixit link.
     
  5. TC_GoldRush macrumors 6502

    TC_GoldRush

    Joined:
    Dec 6, 2017
    Location:
    Nevada, USA
    #5
    Dude you spilt water around the base of your iMwc G4, and left it there for a week! WHAT DID YOU EXPECT TO HAPPEN?
     
  6. Oblak thread starter macrumors newbie

    Joined:
    Oct 16, 2016
    #6
    I meant I left the computer for a week before attempting to turn it on. Of course I didn't leave the water on my desk for that long, I thoroughly wiped it first thing in the morning. It wasn't even a half glass, or I would have cleaned it when it all happened. But yeah, I'm not going to say I expected everything to be A-OK, but given the relatively small amount of water spilled, and the time that had passed, I kinda hoped it would be alright. Alas, seems like the ol' G4 is done for :(

    @CooperBox, yeah I already tried this. Thanks for the suggestion though!
     
  7. TC_GoldRush macrumors 6502

    TC_GoldRush

    Joined:
    Dec 6, 2017
    Location:
    Nevada, USA
    #7
    Sorry mate. Fact still remains that there was a containment breach. Ontop of that, the water was wiped first thing in the morning. . So it was sitting there wet for at least 4 hours. Good luck.
     
  8. Candykane75 macrumors member

    Candykane75

    Joined:
    Jun 14, 2017
    Location:
    holland
    #8
  9. Oblak thread starter macrumors newbie

    Joined:
    Oct 16, 2016
    #9
    Yep, I tried the 10 second thing but no luck. Also tried resetting the PMU. I took the whole thing apart, the PSU looks pristine to my untrained eye. No leakage.
     
  10. Candykane75, Apr 24, 2018
    Last edited: Apr 24, 2018

    Candykane75 macrumors member

    Candykane75

    Joined:
    Jun 14, 2017
    Location:
    holland
    #10
    oke wel ik did my brain of tactic looked at your mother board pictures it looks great i dont see anything wrong with it . these PPC and there PMU are real pain in the $$$ some times you have a muli meter and know how to use it?
    this thread will tell you what voltages your psu should give
    http://www.dremeljunkie.com/2012/05/20-imac-g4-native-psu.html
     

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