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I followed the guide to replace the hard drive, but forgot the thermal sensor in re assembly, what will be the effect if this - will the fan never run or will it always run? Is there any other effect?
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The effects will be way worse that that, they will run making you believe the fans are ok but they will run consistently at low RPM making your iMac overheat.
My suggestion is to leave the sensor on!!! I just bought a cheap craigslist iMac G5 20in 1.8ghz different model than yours but anyways it had a GPU problem and I had to reflow the chip a bunch of times because it kept overheating and eventually I had to reball the soldering on the GPU. I was tearing my hair out trying to figure out why the heck it kept over heating. Then I noticed that the fan speeds were the same no matter what temperature the computer reached and it turns out the stupid HD sensor was missing. I got one from ebay and sure enough the fan speeds were much better and it stopped experiencing overheatng problems.
I would really really not recommend you running it without the sensor, you will be one flash application away from frying your GPU. My advise is to stick that sensor on the hottest component nearby like the heatsink, this will give you higher temp readings increasing your fan speeds thus lowering temperatures. This is the only way to increase fan speeds since fan control apps dont work on G5's.
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Being an imac g5 released 10 years ago I cant find any hdd temp sensors on ebay, and I also need the hdd brackets that secure the hdd in place but cant find them either. It is an imac G5 17", 1.8 Ghz cpu, 1.25Gb RAM, OS X 10.4. overall would be a good computer but I am reluctant to use it for more than 30mins at the max as it would overheat and as u said, fry the GPU. Help is much appreciated
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iMac G5 Temperatures/Cooling Mod
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