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IMac freezing

3269 Views 10 Replies Latest reply: Jul 22, 2008 2:40 PM by Jpfresno RSS
ParatrooperRus Level 1 Level 1 (25 points)
Currently Being Moderated
Jul 20, 2008 11:18 PM
Hi guys.

I really hope you can help me in solving my problem. I have an old Intel (white) IMac. It was working fine for more then 2 years. But somehow it starting to freeze. It's happening all the time. I can't see any logic in it (it's not depending on program or what i'm doing).

Also i'm getting strange black lines across my screen, some huge color lines from the top of the screen and sometimes the screen became totally white.

Any ideas?
IMac, MacBook Pro, Mac OS X (10.5.2)
  • TheDesmodus Level 1 Level 1 (5 points)
    Currently Being Moderated
    Jul 21, 2008 12:37 AM (in response to ParatrooperRus)
    That is odd... I hardly ever come to this forum, but today I did.. wanting to post almost exactly the same question.
    My 2.16Ghz iMac 24"with 2Gb SDRAM in it does almost the same. Strange lines appear, sometimes only in a window, and sometimes across the screen.
    The weirdest thing is that I can take screenshots of these lines:
    http://www.hofhuis.org/meuk/scherm.png

    My Mac tends to crash when I minimize windows during the genie effect (yellow ball).. it crashes halfway the effect. It also freezes when I do processor tough calculations, like converting movie files etc.

    It feels to me that it happens when me Mac gets more used and warmer. After I start it up, all is fine. But after a while the lines start to appear, then a while later windows start acting up, and then it just freezes.
    And it is getting worse and worse with time... I tried installing a new OS, but no dice... it even gave the lines while starting up from the installation DVD.

    Ehm, this actually turned into a whole seperate post.. sorry 'bout that.
    iMac 24", Mac OS X (10.5.4)
  • MarekSz Level 1 Level 1 (0 points)
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    Jul 21, 2008 12:56 AM (in response to TheDesmodus)
    It is common problem, you can find more searching forum with "horizontal lines" keywords.
    Your Mac has failed GPU and need main board replacement - cost ~800 USD.
    Apple refused to start a replacement program despite of large number of failures.
    iBook G3 800 (self-repaired!), iMac C2D 20 late 2006, Mac OS X (10.4.11)
  • TheDesmodus Level 1 Level 1 (5 points)
    Currently Being Moderated
    Jul 21, 2008 1:47 AM (in response to MarekSz)
    This thread might help though... will try it out later tonight:
    http://discussions.apple.com/thread.jspa?messageID=7128445&#7128445

    And it looks like a downgrade to Tiger might be a bonus.
    iMac 24", Mac OS X (10.5.4), 2,16Ghz 2Gb SDRAM
  • MarekSz Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jul 21, 2008 3:39 AM (in response to TheDesmodus)
    iBook G3 800 (self-repaired!), iMac C2D 20 late 2006, Mac OS X (10.4.11)
  • TheDesmodus Level 1 Level 1 (5 points)
    Currently Being Moderated
    Jul 22, 2008 10:58 AM (in response to ParatrooperRus)
    Hi Paratrooper... I did this:
    Installed SMCFanControl and I have my fans running fast (31C temp 3515RPM).
    In the meantime I am running BOINC Seti.. eating up 100% of my cycles.. and sofar no problems...
    iMac 24", Mac OS X (10.5.4), 2,16Ghz 2Gb SDRAM
  • Manuel_Z Calculating status...
    Currently Being Moderated
    Jul 22, 2008 11:02 AM (in response to ParatrooperRus)
    people, totally off topic but i cant figure out where the POST A QUESTION is.... and if you can answer it here then cool. I upgraded my ram on my imac. The thing is, i want to sell my old ram. would i need it if there was a malfunction on my mac when i needed to ship it to apple?
    iMac 24inch 4Gb of ram, Mac OS X (10.5.1), Windows XP (bootcamp)
  • TheDesmodus Level 1 Level 1 (5 points)
    Currently Being Moderated
    Jul 22, 2008 11:56 AM (in response to Manuel_Z)
    Hi Manuel,

    I have no clue how to post a new topic here. RAM is something that you are allowed to change in your Mac... it is not like a logic board. So you do not break your warrenty is you replace it... so the answer is.. you can sell it.
    iMac 24", Mac OS X (10.5.4), 2,16Ghz 2Gb SDRAM
  • Jpfresno Level 4 Level 4 (3,020 points)
    Currently Being Moderated
    Jul 22, 2008 2:40 PM (in response to TheDesmodus)
    TheDesmodus wrote:
    I have no clue how to post a new topic here.


    *Hi Desmodus, Welcome (Back)* to Apple's Users Help Users Forums.

    You are currently on a Topic = Thread Page.
    Go back 1 level to a Forum page and find the button on the upper left. If you err and go back 2 levels you will be in a list of forums or the Category page w no capability of posting at that level. It takes a while to get used to how all this is organized. Hang in there.

    Good Luck, JP
    11/06 Imac 17 Intel C2D 1 GB 667 MHz SDRam OWC Merc FWHD SuperDuper, Mac OS X (10.4.11), *Do not start vast problems with a half vast mind.*

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