Is it the Logic Board?

Discussion in 'iMac' started by jsunem, Oct 21, 2013.

  1. jsunem, Oct 21, 2013
    Last edited: Oct 21, 2013

    jsunem macrumors newbie

    Jan 12, 2009
    My friend brought me his 2008 24" iMac Intel Core 2 Duo 3.06Ghz - A1225 to fix up so he could sell. It was acting funny. Start up would always be a kernel panic, and when installing OS from Disc 1, the screen would get lines and choppy looking. I was baffled and so took it in to the genius bar for diagnosis. They said they suspected the HD was bad and the graphics card was dodgy, estimate was $400 to fix which is all it was worth on a good day for trade-in online. My friend asked me to do my best on my own.

    I ran a hardware test off disc 1, it passed. I ran the extended HD test, and the screen got all funky toward the end, but I could still see that it passed.

    I pulled out the HD and ran a battery of stress tests on the drive with Drive Genius and the drive is perfectly fine. (I figure that with it being out of warranty the Genius' couldn't do more than a cursory diagnostic without a commitment on my part to pay) So in the end I reformatted the HD and put everything back together.

    I ran the Hardware Test again, same results.

    I attempted to start from disk 1 to reinstall OS. I only got as far as the gray screen with Apple and gear when it froze. I repeated the process several times with no change. Each time the screen looks fine.

    At this point I think its the logic board. Would like to get your thoughts and ideas. I know the machine is nearly "vintage" but its a fun and fascinating project for me. If I can fix it and he can pickup some money on a trade-in then awesome! If not and we can sell the good stuff for parts then that'd be great too.
  2. jaxhunter macrumors regular


    Dec 14, 2012
    The most likely place to start with that one is the video card. On those models it is on a daughtercard and can be replaced apart from the logic board.
  3. topmounter macrumors 68020


    Jun 18, 2009
    FEMA Region VIII
    I had a similar problem on my "Early 2009" 24-incher. The Apple Store initially thought it was the video card, but it turned out to be the Logic Board. It wasn't cheap ($500'ish I believe), but it has been flawless ever since.
  4. jsunem, Oct 27, 2013
    Last edited: Oct 27, 2013

    jsunem thread starter macrumors newbie

    Jan 12, 2009
    Test LED's

    I thought I read somewhere that this board had 4 diagnostic LEDs. Does anyone know anything about those?
  5. TayHarley macrumors member


    Mar 14, 2008
    did you get anywhere?

    - my 2008's just had the hard drive replaced and the consensus is that it is the Logic Board not the video card. Being quoted £600 (after trading in the old board) to replace it. Extreme !:eek:

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