Yup, I am seeing lockups now pretty often on my early 2009 ATI 4850 iMac. It seem to happen when the graphics card, GPU, get up above 65 degrees C. I have never seen it get above 70 degrees yet, but it doesn't seem to take much over 65. I had 2 complete lockups in OS X today( EveOnline and Safari) and 2 crashes under boot camp (fallout 3).
According to AppleInsider: Apple may already be aware of the issue. Some of those calling the company's support line have heard from technicians that there are numerous reports and that a fix is in the works, possibly arriving along with the looming Mac OS X 10.5.7 update. Some are being offered replacement systems after unsuccessful troubleshooting.
Saturday, April 18, 2009
iMac/ATI 4850 lockups, GPU heat problems?
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Can you try turning off your WiFi card, see if that stops the freezing? You can use ethernet if you need to use the internet.
ReplyDeleteSee: http://forums.macrumors.com/showthread.php?t=688393
Well, it might take a while, my TimeCapsule is down stairs. I might be able to hook up to my old iMac. I will see.
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