On Nov 20, 2014, at 09:23 AM, Richard Meyeroff wrote:
I have an iMac model 9,1 which is producing what I believe is fan
noise. How can I check to see if I am correct and if so how to
correct it?
Fan speed vs Power Manager vs dying bearings vs dust...
Fan speed is controlled by the Power Manager, as a function of the
temp sensors. Install something like iStat Menus or MenuMeters, so
you can view the temps. If they're climbing, that's a possible sign
of fan issues. Check your system log for thermal warnings / shutdowns.
Try resetting your nvram. Could be that the Power Manager is confused.
Try sucking out the dust (a must if you have shedding pets!). Find
the vent holes and apply the business end of a vaccuum cleaner hose.
Depending on the Mac model, opening 'er up and doing a full vaccuum
job is often a good plan.
HTH,
- Dan.
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