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I have a 2-year-old iMac all-in-one 216 Ghz Core 2 duo with OSX 10.4.11. For the last week or so, it has suddenly started doing weird things- little horizontal lines appear in some windows (these lines move with the windows, and sometimes disappear when I click near them), and the computer just goes blank sometimes- doesn't shut down completely, the screen just goes dark, and I have to restart it. I've been shutting it down a lot more than usual, rather than leaving it running continuously, since leaving it on seems to make it more likely to go blank or freeze. Help!

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  • knittique Jul 24, 2009

    I don't know if this makes a difference or not, but your reply sounds like you think I have a laptop- it's a desktop. Sorry for the misunderstanding. Otherwise, what you said makes sense, in fact I thought myself it had to do with overheating, since I only starting having these problems when the weather suddenly got really hot.

  • knittique Jul 24, 2009

    Thank you! Everything you're saying makes sense to me, since I had suspected overheating, but I would not have known what to do about it. Thanks again! -- Lindy



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This sounds like the video card is overheating or is already been damaged by overheating. Lines and such appear if the card gets too hot or the ram memory the card uses is faulty.

Both of those are not replaceable as they are both build into the same main board, in most laptops, which means that the whole mainboard of the computer would need to be replaced, basically that is like buying a new machine and it costs around the same.

If you are on warranty, your lucky, use your warranty. If your outside of warranty, the repair will not be cheap.

If it only happens when the machine has been used for a while and gets hot, changing the thermal grease on the cpu and video heat sinks might help a little(best left to experienced people) OR try one of those laptop cooling pads.

something like this one maybe:

this is definitely a hardware problem or overheating.

Posted on Jul 24, 2009

  • Ekse Jul 24, 2009

    I forgot to mention that you could use canned air to blow dust out from the ventilation holes on the laptop and from the fans and its surroundings to get better airflow.

  • Ekse Jul 24, 2009

    Oh You have a Desktop, Yes I though you had a Mac Laptop.

    But this one seems to be one of those macs that are build into a display? so its pretty much the same thing as a laptop and I don't think that the video card would be replaceable if its faulty but I would have to look into it more to be sure.

    But sure you can use canned air, or open it up and clean the dust, with air only.

    maybe a local apple store or computer repairer can help you with the cleaning and possibly replacing the thermal grease that is used between the components and the heatsinks to transfer heat effectively.

    If you think you can do it yourself the stuff doesn't cost much.



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