Q: iMac CPU temperature sensor faulty?
Help required to keep an old iMac alive!
The CPU fan on my daughter's iMac is running fast and noisily 99% of the time, whilst MacFanControl and iStatPro are reporting zero rpm. The other 1% of the time the above apps. report the fan running at around 800 rpm. All the while, the CPU temperature is reporting 42-50c.
When I say fast & noisy, I mean the machine is unusably loud.
And when I say old iMac, I mean 2006 2GHz Intel Core Duo - which can't be upgraded beyond OS X 10.6.8.
Clearly it's not worth spending much money to keep this machine running. Equally, it more than met the needs of primary schooler until this issue.
Having read through several related topics on various forums, I'm set to conclude the CPU temperature sensor is faulty or detached. I'm presuming the fan itself is ok as it's evidently working!
Points to note:
I have reset SMC and PRAM
I have hoovered out whatever dust I can without opening the m/c up.
I'm unable to locate my Apple Hardware Test disc.
Nothing significant has happened to the iMac recently - no upgrades etc.
Can anyone offer up any other possibilities before I load up iFixIt and get the screwdrivers out?
Thanks to anyone who might be able to advise me.
Ces
iMac, Mac OS X (10.6.8), Noisy Fan
Posted on Sep 21, 2016 10:55 AM