iMac 24" 2008 Problem

Discussion in 'iMac' started by uneo, Feb 26, 2015.

  1. uneo macrumors newbie

    Feb 26, 2015
    hi guys,

    i bought a defect imac 24" 2008 model A1225, when i start it & it gets stuck on loading screen, even if i try to boot from OS X installation disk or if i boot to recovery disk, it gets stuck at same place, i have run apple hardware test and do not fins any problems, the 4 leds on motherboard are also ok, i tried to boot hard drive in other mac and OS X boots and works fine, i have read on the internet that these model have problem with video cards, i just need to be sure that is that the issue?, because i want to send video card for repair via eBay.
    see pictures and you will see som green lines on screen.

    Attached Files:

  2. uneo thread starter macrumors newbie

    Feb 26, 2015
  3. Brian33 macrumors 6502a

    Apr 30, 2008
    USA (Virginia)
    It appears that we have the same, or almost the same, iMac. Mine is an A1225 "iMac8,1", 24-inch Early 2008 with 2.8 GHz Core2Duo. Mine has ATI Radeon HD 2600 Pro graphics, but some Early 2008's had some NVIDIA card that was (I think) more prone to failure.

    Which graphics card does your have?

    Unfortunately, I don't think I can help much. It seems you've tried everything I can think of. I would be cautious about assuming that the video card is the problem, because I thought the logic board LEDs were supposed to indicate video card problems, and you say your LEDs are all OK. Of course I might be wrong and maybe some video card problems don't show on the LEDs...

    If yours has the NVIDIA card, what I've read about it would make me not bother getting it repaired. Instead, I'd look for the Radeon HD 2600 Pro like mine has. I think I've seen them on eBay, but not cheap.

    What you really need is someone you can borrow a compatible card from -- to verify that yours is actually the problem. (Sorry, I can't lend you mine -- I need to use it!)

    If you have the original OS X installation DVDs (should be OS X 10.5 Leopard) -- does the machine fail to boot from them, too? I see you've installed Yosemite, and that should work. (I haven't tried Yosemite yet -- currently running 10.8.5 Mountain Lion.)

    If you can't borrow a graphics card, I guess you'll have to take a chance or give up.

    Found this in an old iFixit web page I saved to my drive, but you probably know this info already:

  4. uneo thread starter macrumors newbie

    Feb 26, 2015
    Thanks alot for your reply, i have solved the problem. I baked the videocard for 10 mins and cleaned heatsink and fans which was the most dirtiest ive seen. That was all i did and it works very nice #
  5. Brian33 macrumors 6502a

    Apr 30, 2008
    USA (Virginia)
    Hey, that's great! You are very resourceful.

    Hope you'll like it as much as I like mine, which I still use a lot every day. I highly recommend installing an SSD if you haven't already!
  6. BrettApple macrumors 65816


    Apr 3, 2010
    Heart of the midwest
    Definitely a bad NVIDIA GeForce 8800 GS. They are known to have issues along with most any other Nvidia based Mac (or PC) from 2007-2008, especially the 8600m in the MBP of that era. Bad solder was used that cracks over time from heating and cooling.

    As you've discovered, you can "fix" it for a while by reflowing the solder (melting it and getting rid of the cracks basically). I hate to say this though, but it's only a temporary fix and the issue will crop back up later. The only way to completely fix it is to put a different video card in it such as the ATI 2600 Pro, or another 8800 GS that will ultimately fail like the rest.

    It's great as long as it's working, and there are places out there that will actually go through the card and completely re solder it with better solder. It's not cheap, but it's a fix that should last.

    Personally I'd try and stay away from Nvidia based Macs from that era, but seeing as you already have it. You can keep baking or using a heat gun on the video card for a while without loosing much, other than time. Or find a replacement. I'd go for replacing the card or getting a newer Mac with a good one. 2009+ Macs are pretty good, with the exception being anything made in 2011 using ATI cards. They have the same issue. 15" MBP and 27" iMac mostly.
  7. lucas2205 macrumors newbie

    May 1, 2015
    I have the exact same problem as you, and I'm planning on baking it sometime this week, can you please tell me if your mac is still working fine and that you didn't have to repeat the process since?
    Also any tips on doing this??

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