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iMac cpu fan running at 4400RPM after 20 minutes of use?


My iMac G5 (Powermac8,1) cpu fan is running at 4400RPM after 20 minutes of use. It doesn't matter what I am doing.

I have zapped the pram, blew out the iMac with compressed air and have reset the power management unit.

Could the cpu need to have a new layer of thermal paste applied?

System Fan 1240 RPM

CPU Fan 4400 RPM

Hard Drive Fan 1800 RPM

HD 50º Celsius

CPU 62º Celsius

Hard Drive 47º Celsius

Please help this fan noise is too loud to work on the computer.



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Your CPU is running hot so it likely does need a new coat of thermal paste (also the age of the system warrants it as well).

A quick blow of can'ed air in its self won't do to much. Often you need to do some scrubbing with a soft painters brush (Don't forget about ESD). The heat sinks, fan blades and the power supply often need it the most.

Follow the IFIXIT guide iMac G5 17" Model A1058 Logic Board Replacement

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Thanks. I will tear it down and try that.


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