iMac G5 Overheating...

Discussion in 'Macintosh Computers' started by montypython, May 27, 2005.

  1. macrumors newbie

    Joined:
    May 27, 2005
    #1
    I was wondering if there was anyone who has developed their own fix or come across a fix for the iMac G5 (rev a or b) overheating problem. It seems there are a lot of reports out there on this, but no one has thought about a fix yet. Any help will be great.
     
  2. macrumors 65816

    James Philp

    Joined:
    Mar 5, 2005
    Location:
    Oxford/London
    #2
    Is yours overheating?
    What happens when it does?
     
  3. macrumors member

    paulie

    Joined:
    Jan 14, 2003
    Location:
    Saskatoon, Canada
    #3
    Overheating?

    I have a new 20" iMac G5 2Ghz. I run it pretty hard (play a DVD while playing WoW, while making iMovie process titles) and the only thing that happens is that the fan comes on so I can hear it.

    Rock solid performer this beast is.
     
  4. macrumors 68000

    Xtremehkr

    Joined:
    Jul 4, 2004
    #4
    Never had an overheating problem. On wednesday I'll be using it in Phoenix, if it doesn't overheat there. So we'll see how that goes, but if it doesn't overheat there I can't think of many places that are hotter in summer. Maybe Death Valley.
     
  5. thread starter macrumors newbie

    Joined:
    May 27, 2005
    #5
    I am debating between the 15' PowerBook G4 and the iMac G5 for video editing and web program development. I was all set to get the G5, but then found these isolated instances and wanted to make sure that I didn't get into something that I would regret. So for now I am stalled in my decision making process and was hoping that there was some fix that I could make as soon as I got it that would help my iMac from not overheating.

    Thanks Everyone.
     
  6. macrumors 6502a

    vouder17

    Joined:
    Apr 30, 2003
    Location:
    Home
    #6
    Well my fans are almost constantly whining up...it is really annoying, i have only really noticed this since Tiger... :(
     
  7. macrumors 65816

    asif786

    Joined:
    Jun 17, 2004
    Location:
    London, UK.
    #7
    heh, i know what you mean. every time i'm in the same room as this thing i feel like banging my head on the wall!

    i'm just going to try phoning apple up and kicking up a fuss until i get the problem escalated and they agree to replace the unit.

    monty, if you're thinking of getting an imac g5, remember that they've just been updated - apple tend to fix these annoying products when rev.2 comes out, so maybe you'll be ok with an imac g5.. :)
     
  8. macrumors 6502a

    Joined:
    Jan 8, 2005
    #8
    This sound bad

    My friend who I got to switch to a Mac (iMac G5 17") in October, called me today to say that his machine does the same. In the console it displays a message about overheating.

    I work as an Apple Authorised Technician, and in my job today, we had an iMac G5 with the same fault. It was a 20" model.

    Since the iMacs came out in last year I have fixed loads and loads of iMac G5 faults but have never come across this problem.

    Now im worried!!!
     
  9. thread starter macrumors newbie

    Joined:
    May 27, 2005
    #9
    What are the major problems you have found and how often are you seeing them?

    If you were in the market for a computer would you get the iMac G5.
     
  10. macrumors 68020

    killuminati

    Joined:
    Dec 6, 2004
    #10
    I just got my 17" 2Ghz yesterday. At first the fans were driving me crazy. But I found, that if you change the processor performance from Highest to Automatic, it completely fixes the problem. Before my fans were blasting just surfing the web. Now I can do that and its whisper quiet.
     
  11. macrumors 6502a

    nylon

    Joined:
    Oct 26, 2004
    #11
    Yes, switching the processor performance to 'high' causes a constant whine of the fan and high temperatures. However, in 'automatic' mode everything runs silent and at ambient temperatures.
     
  12. macrumors 68020

    Macky-Mac

    Joined:
    May 18, 2004
    #12
    if you havent encountered this problem before then thatt would indicate it's a pretty rare problem.....I don't remember reading about "overheating" here on these boards either and if it was a commonm problem you can be sure it would be the topic of many threads asking for help
     
  13. macrumors 6502a

    vouder17

    Joined:
    Apr 30, 2003
    Location:
    Home
    #13
    This is a good idea...Maybe i should do the same. Maybe they can change it with a Rev B :eek: :D :D :D
     
  14. macrumors 65816

    Joined:
    Apr 15, 2004
  15. macrumors 68000

    mklos

    Joined:
    Dec 4, 2002
    Location:
    My house!
    #15
    There is something that will spins the fans down to where they're supposed to be. What happens is that the iMac gets really hot and so the fans kick up quite a bit, but when the iMac cools off, the fans don't spin back down to where they were when you first used it. So even when its running at normal temps, it seems loud.

    Here's what to do:

    1. Reboot your iMac G5 and press and hold Apple+Option+O+F until it says on the screen to release those buttons. You're now in the Open Firmware.

    2. Type in the following EXACTLY as typed:

    reset-nvram (press return after typing that)

    3. Then type in reset-all (press return after typing that) and you're iMac will restart.

    4. Let your iMac boot all the way up and then shut it off.

    5. Unplug it and then take the back off to get access to the logicboard.

    6. Near the center of the logicboard you'll see 2 buttons. Press the lower of the 2 buttons ONLY ONCE!!!

    Now if you have to ask what the logicboard is, then you shouldn't be doing this.

    I'm not responsible for screwing up your iMac!!!!!
     
  16. macrumors 6502a

    vouder17

    Joined:
    Apr 30, 2003
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    #16
    Are you talking to Moi...If so..nope i dont do virus programs.. ;)
     
  17. macrumors regular

    joshua_msu

    Joined:
    Aug 5, 2004
    Location:
    chicago (formerly detroit)
    #17

    What, are you using it outside?
     
  18. macrumors 68030

    Platform

    Joined:
    Dec 30, 2004
    #18
    That's good but does it affect performance :confused: Well a bit but how much ;)
     
  19. macrumors 6502

    Etrain

    Joined:
    Feb 26, 2005
    Location:
    Land of Cleve
    #19
    I have mine set to auto and it's very fast. I don't notice any difference during normal use like browsing, iTunes, etc. For intense things I switch to highest.
     
  20. macrumors 68030

    Platform

    Joined:
    Dec 30, 2004
    #20
    Well can you please say what intense is......PS, games or :confused:
     
  21. macrumors 6502a

    Joined:
    Jan 8, 2005
    #21
    20" Invertors failing producing a half lit screen

    17" Noisey PSU's

    20" Middle screw to remove back cover turns forever leaving the back stuck on

    17" & 20" models very fussy about ram

    17" & 20" models with noisey fans

    17" & 20" models lacking power

    These are the common issues that I see most, personally I wouldn't buy one. Its too early to comment on the Rev.B's
     
  22. macrumors 6502a

    vouder17

    Joined:
    Apr 30, 2003
    Location:
    Home
    #22
    Ok it isnt that bad. i am very happy with my iMac. The only annoying thing that i really have is that the fans whirl up quite often. But this has been a problem that has only started since Tiger. I truly believe that Tiger actually still needs a bit of work. Later this week i am gonna re-install tiger and see if it fixes the problems....
     

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