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iMac 20" (Late 2008) Freezing Issues

570 Views 14 Replies Latest reply: Feb 8, 2013 11:46 AM by l3c RSS
l3c Calculating status...
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Jan 13, 2013 11:11 AM

iMac 20" (Late 2008)

2.66GHz Intel Core 2 Duo

4GB DDR2 SDRAM

ATI Radeon HD 2600 Pro 256MB

OS X 10.8.2

 

I am having a few issues with the iMac, it seems every couple of days the iMac will just radomly freeze up. Being a computer engineer and knowing the iMac was out of date i thought it was because it was getting to hot so I stripped it down and cleaned out the inside and the fans. This did not cure the problem as it just froze a few minutes ago.

 

When the iMac locks up sometimes the screen is still showing what I was doing but I cannot move or do anything, one time I have had a white screen and most of the time its is a dark blue. When I reset the Mac it works perfectly fine and boots up nice and quick, also it is not hot at all.

 

When this happens there is normally only 2-3 programs open (Chrome, iTunes and maybe Skype), also when it freezes sometimes the music is still playing in the background and then that will stop about 30 seconds after.

 

Is there anything else I can do to solve this problem or a check I can do to see what is causing it?

iMac, OS X Mountain Lion (10.8.2)
  • a brody Level 9 Level 9 (62,195 points)
    Currently Being Moderated
    Jan 13, 2013 12:27 PM (in response to l3c)

    Have you run the hardware test that came with the computer?

  • a brody Level 9 Level 9 (62,195 points)
    Currently Being Moderated
    Jan 21, 2013 6:35 AM (in response to l3c)

    Thermal paste is one of those rock and a hard place problems.   Too much, you give it too much insulation. Too little, and it overheats on its own.  It is best to let an authorized service technician do a thermal paste application if you aren't one yourself, as only they know the exact amount that will qualify for the equipment.

  • MichelPM Level 5 Level 5 (7,205 points)
    Currently Being Moderated
    Jan 25, 2013 3:58 AM (in response to l3c)

    Is the RAM to Apple's specs?

    Macs are very picky about RAM and just can't use any ole' PC RAM.

    Here are the proper RAM specs for your model iMac.

     

    6.0 GB (Actual) 4.0 GB (Apple)
    Memory Slots2 - 200-pin PC2-6400 (800MHz) DDR2 SO-DIMM

     

    Reliable Mac RAM can be purchased cheaply from online Mac RAM vendors Crucial memory or OWC (aka macsales).

    This maybe your issue.

  • MichelPM Level 5 Level 5 (7,205 points)
    Currently Being Moderated
    Jan 25, 2013 4:06 AM (in response to MichelPM)

    Another concern

    4 GBs of RAM in your iMac is enough to run OS X alone, by itself.

    Every new iteration of OS X uses more CPU, GPU, RAM and hard drive resources.

    OS X needs to have a working minimum RAM amount of between 2-4 GBs to do its thing smoothly, quickly and efficiently.

    Start running additonal apps atop or along with OSX and your iMac slows in performance and may, on occasion, crash.

    Since you like leaving applications running in the background, I would recommend installing the additonal 2 GBs of RAM to bring your iMac to a max. of 6 GBs of RAM.

    This should help you with some of your issues if it isn't hardware related.

  • MichelPM Level 5 Level 5 (7,205 points)
    Currently Being Moderated
    Jan 25, 2013 6:04 AM (in response to l3c)

    Tthe RAM has to be to the exact specs.

    No variation.

    And no, if the RAM spec is close, it may indeed boot up, but the Mac could exhibit issues right away or may have issues that could happen over say a few days to a week.

    If your IMac is crashing, it maybe that the RAM is not quite be the proper specs.

    Crucial memory and OWC have the proper and reliable RAM for Macs.

    If you bought this RAM locally at some electronics or computer store, I can almost guarantee it's not proper spec'd RAM.

  • MichelPM Level 5 Level 5 (7,205 points)
    Currently Being Moderated
    Jan 25, 2013 6:08 AM (in response to l3c)

    And yes, OWC has determined that your model iMac can take 6 GBs of RAM.

    OWC tests every new Mac that comes out to see if they can take more RAM than Apple recommends.

    Some, but not all Mac models can take an amount of additional RAM over what has been tested by Apple.

  • a brody Level 9 Level 9 (62,195 points)
    Currently Being Moderated
    Jan 25, 2013 7:39 AM (in response to l3c)

    Getting the exact speed is not necessarily sufficient.  Timing has to be exact.  That's often not fully published.   Only vendors that sell RAM by Mac model name & vintage are known to give you the correct specs*:  http://www.macmaps.com/badram.html  OWC (macsales.com) is one of them.

    OS X Mountain Lion, * Links may give me compensation

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