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<blockquote data-quote="homsar" data-source="post: 1890839" data-attributes="member: 408746">Himy 27” 2009 iMac has started overheating. A few minutes after boot the fans spin up to maximum and never spin down. Looking at iStats, the GPU die and heat sink are both very hot—80-100 degrees C, with the die temperature being the hotter of the two and flashing red in iStats.I’ve tried cleaning the GPU and heatsink and reapplying fresh Arctic Silver, but no change. The temperature gradually increases over the course of 15 minutes. I don’t see any visual corruption at all. I can’t see any processes using significant resources that would be stressing the GPU. (Just cloudd and mds_stores being busy as I’ve not touched the machine in a year while waiting for time to try re-pasting it.)Weirdly the system goes straight from no audible fan to maximum, jet engine taking off level fan. (I’d have expected it to gradually increase fan speed as the GPU temperature got hotter? But even at max fan speed, it can’t seem to get the GPU temperature back down.)Is this a sign that I need to replace the GPU? Or bake it to reflow it? Or is it some other problem that’s more easily/less expensively fixed? (I can’t believe how expensive GPUs are currently even for such an old system)Many thanks in advance for any tips!</blockquote>

[QUOTE="homsar, post: 1890839, member: 408746"] Hi my 27” 2009 iMac has started overheating. A few minutes after boot the fans spin up to maximum and never spin down. Looking at iStats, the GPU die and heat sink are both very hot—80-100 degrees C, with the die temperature being the hotter of the two and flashing red in iStats. I’ve tried cleaning the GPU and heatsink and reapplying fresh Arctic Silver, but no change. The temperature gradually increases over the course of 15 minutes. I don’t see any visual corruption at all. I can’t see any processes using significant resources that would be stressing the GPU. (Just cloudd and mds_stores being busy as I’ve not touched the machine in a year while waiting for time to try re-pasting it.) Weirdly the system goes straight from no audible fan to maximum, jet engine taking off level fan. (I’d have expected it to gradually increase fan speed as the GPU temperature got hotter? But even at max fan speed, it can’t seem to get the GPU temperature back down.) Is this a sign that I need to replace the GPU? Or bake it to reflow it? Or is it some other problem that’s more easily/less expensively fixed? (I can’t believe how expensive GPUs are currently even for such an old system) Many thanks in advance for any tips! [/QUOTE]

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