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Jul 22, 2012 3:48 AM in response to RRFSby Zahori,RRFS, I've proceed as you suggest, cleaning out the dust of my iMac (I don't think it had much anyway...it's from early 2009 and it has been in rooms with very little exposition to dust since then). But the problem is still there, I've had a crash several hours after the cleaning. I tried with Joeldm suggestion too, unchecking Enable Quartz Extreme, but I had a new crash after two weeks working fine.
So I don't have any more ideas (I've tried many other commented in other threads)...I will have to take it to an Apple Store and most probably they will replace the graphic card installed (Nvidia GT120), as other users have commented in other threads. But with apparently so much people having similar issues with this NVIDIA card (or GT130 one), I think Apple should investigate if this is a common defect on those cards and include them in a Replacement Program if that is the case. It wouldn't be the first time for a NVIDIA card, considering issues with GeForce 8600M GT in MacBook Pros...
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Jul 29, 2012 8:52 PM in response to Zahoriby strfox,Zahori, I'm having the same problem as well. I spoke with Apple Care over the phone, and ended up bringing it in to the Aple store to get it checked out. They kept it for about a week and ran diagnostics only to tel me that they could not detect any problems with the hardware. I thought maybe it could be a software related issue so I wiped the system clean, updated to Mountain Lion and the only major piece of software I have on now is Aperture which freezes so frequently its not even worth using. I assumed from the first time this happened that it had to do with the NVIDIA GeForce 130 but according to apple techs, it seems to be running fine.
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Jan 9, 2014 10:58 AM in response to Dexterdawgby pushsingh56,i had same problem. well delete any and all antivirus software from your mac. then verify and repair disk and restart it. it should be ok.
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Jan 9, 2014 2:04 PM in response to pushsingh56by Drunken Hobo,https://discussions.apple.com/message/18341164#18341164
imiac early 2009 gt 130 grapic card kernel panics, screen freezes, imac restarting itself etc read above link