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One way to fix an overheating graphics chip in an iMac
Authored by: sfgecko on Jan 20, '10 10:29:22AM

a lot of people are having this problem with the 2006 imacs:

of course, apple refuses to acknowledge it as a widespread problem.

unfortunately, if you have the ATI X1600, the GPU is soldered onto the logic board, so the entire logic board has to be replaced ($600-$800). on the 24", the nvidia 7300/7600 graphics card can be replaced separately ($200-$300). but since they don't make those cards any more, the best you'll get is a "remanufactured" one, which will most likely conk out within a year.

the imac is poorly designed and makes for a better toaster. the power supply unit sits right above the 3.5" hard drive. the hard drive fan sits below the hard drive and blows hot air right over the power supply unit. this could also be why the imac experiences random shutdowns and freezes when it gets too hot.

here is a link to a fan control app specifically for the 2006 imacs:

2006 iMac Service manuals:
20" -
24" -

personally, i would not recommend an imac to any of my peers and friends. they may look nice on the outside, but inside they're a disaster waiting to happen. couple that with apple's poor QC of late, and you're spending a lot of money for sub-par products.

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