The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
Why is my iMac fan suddenly so loud? I have checked the Activity monitor and no applications are hoarding processing capacity. I have eliminated all automatic log in items in Preferences. Any suggestions? Thanks!
iMac, Mac OS X (10.7.4)
This thread started five years ago and is probably getting ignored by the experienced helpers here. Please start your own thread with a full description of you iMac from "About the Mac including sub-model (example: "Mid 2010 27-inch") and what macOS version it is running. DO NOT post the serial number for security reasons.
Power or other problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset:
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Try Resetting the System Management Controller (SMC).
Suddenly after Hurricane Irma, my iMac's fan is running constantly....loud. I have reset as instructed now, twice in three days. Any other recommendations?
Kappy and John Galt, thank you! It worked, you saved me a trip to the Apple Store. I can go to sleep happy my iMac is OK. Thank you very much. Rob
You're welcome.
Considering that I can't walk past an Apple Store without dropping $3000 who knows how much you saved.
😎
I tried this and it is still making noise. Help!
THANK YOU!!!
Thank you John. This worked perfectly.
It worked! Can't believe it. Thank you!
Why is my iMac fan suddenly so loud? I have checked the Activity monitor and no applications are hoarding processing capacity. I have eliminated all automatic log in items in Preferences. Any suggestions?
